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- HabaneroStrain of chili (Capsicum)
- HaemodoraceaeHaemodoraceae is a family of perennial herbaceous angiosperms (flowering plants) containin
- Haemophilus influenzaeSpecies of bacterium
- Hairy leukoplakiaHairy leukoplakia is a white patch on the side of the tongue with a corrugated or hairy ap
- Hallucinogenic bolete mushroomType of psychoactive fungus
- HalobacteriumGenus of archaea
- HalophyteSalt-tolerant plant
- HalosphaeriaceaeFamily of fungi
- Handkea utriformisSpecies of fungus
- Hannes HertelHannes Hertel is a German lichenologist and taxonomist and was Director of the State Herba
- Haplophyllum (plant)Haplophyllum is a genus of flowering plants belonging to the family Rutaceae. It is the on
- HardwoodWood from angiosperm trees
- Harley Harris BartlettHarley Harris Bartlett (March 9, 1886 – February 21, 1960) was an American botanist, bioch
- Harold E. MooreHarold Emery Moore, Jr. (July 7, 1917 – October 27, 1980) was an American botanist especia
- Harold St. JohnHarold St. John (July 24/25 1892 – December 12, 1991) was a professor of botany at the Uni
- HarpidiaceaeHarpidiaceae is a small family of lichen-forming fungi, containing two genera and five spe
- Harposporium anguillulaeHarposporium anguillulae is a member of the genus Harposporium. It is an endoparasitic nem
- Harringtonia lauricolaGenus of fungi
- Harry Luman RussellHarry Luman Russell (March 12, 1866 – April 11, 1954) was an American bacteriologist and e
- Hartig netNetwork of inward-growing hyphae
- HashishCompressed form of cannabis resin
- Hass avocadoAvocado cultivar
- HatmakingManufacture and design of hats and headwear
- HaustoriumIn botany and mycology, a haustorium (plural haustoria) is a rootlike structure that grows
- HazelGenus of trees
- Health claimClaim by a manufacturer of food products
- Heart rotFungal disease of trees
- Hebeloma crustuliniformeSpecies of fungus
- Hebrew characterThe Hebrew character (Orthosia gothica) is a moth in the family Noctuidae. The species was
- HedyosmumHedyosmum is a genus of flowering plants in the family Chloranthaceae. There are about 40
- HedysareaeHedysareae is a tribe of plants in the subfamily Faboideae. Hedysareae species have loment
- Heinrich RehmHeinrich Simon Ludwig Friedrich Felix Rehm (20 October 1828, Ederheim – 1 April 1916, Muni
- Heirloom plantHistoric food crop cultivar
- HeliantheaeTribe of sunflower plants
- HelichrysumThe genus Helichrysum consists of an estimated 600 species of flowering plants in the sunf
- Helichrysum italicumHelichrysum italicum is a species of flowering plant in the family Asteraceae. It is somet
- Helicobacter pyloriSpecies of bacteria
- HeliocybeGenus of fungi
- HeliotropismHeliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers
- Helleborus foetidusHelleborus foetidus, known variously as stinking hellebore , dungwort, setterwort and bear
- Helminthosporium solaniSpecies of fungus
- HelocarpaceaeHelocarpaceae is a family of lichen-forming fungi in the subclass Lecanoromycetidae. The f
- HelocarponGenus of lichen-forming fungi
- HelotiaceaeFamily of fungi
- HelotialesOrder of fungi
- HelvellaGenus of fungi
- Helvella crispaSpecies of fungus
- Helvella lacunosaSpecies of fungus
- HelvellaceaeThe Helvellaceae are a family of ascomycete fungi, the best-known members of which are the
- HemerocallidoideaeHemerocallidoideae is a subfamily of flowering plants, part of the family Asphodelaceae se
- HemibiotrophsHemibiotrophs are the spectrum of plant pathogens, including bacteria, oomycete and a grou
- HemileiaGenus of fungi
- Hemileia vastatrixSpecies of fungus that infects coffee plants
- HemimastigophoraGroup of single-celled organisms
- HemimycenaHemimycena is a genus of fungi in the family Mycenaceae. The genus has a widespread distri
- HempAgricultural cannabis plant
- Hemp milkHemp milk, or hemp seed milk, is a plant milk made from hemp seeds that are soaked and gro
- Henry Cranke AndrewsEnglish botanist, botanical artist and engraver
- HepaticaHepatica (hepatica, liverleaf, or liverwort) is a genus of herbaceous perennials in the bu
- Hepatitis C virusSpecies of virus
- Heracleum (plant)Heracleum is a genus of biennial and perennial herbs in the carrot family Apiaceae. They a
- Herbal teaBeverage made from infusing or decocting plant material in hot water
- HerbariumScientific collection of dried plants
- Herbert Huber (botanist)Herbert Franz Josef Huber (1 January 1931 – 1 October 2005) was a German botanist. At the
- HericiaceaeThe Hericiaceae are a family of fungi in the order Russulales. The best known genus is Her
- HericiumGenus of fungi
- Hericium abietisSpecies of fungus
- Hericium cirrhatumSpecies of fungus
- Hericium erinaceusEdible mushroom
- Herpes simplex virusSpecies of virus
- HerpesviridaeFamily of DNA viruses
- HerpomycesHerpomyces is a fungal genus in the order Herpomycetales (Laboulbeniomycetes), with specie
- HerpotrichiellaceaeFamily of fungi
- HesperocyparisHesperocyparis (western cypress) is a genus of trees in the family Cupressaceae, containin
- Hesperocyparis lusitanicaCentral American and Mexican species of western cypress
- Hesperocyparis macrocarpaSpecies of conifer
- HeterobasidiomycetesClass of fungi
- HeterobasidionGenus of fungi
- Heterobasidion annosumSpecies of fungus
- HeterogastridialesOrder of fungi
- HeterothallismSexes that reside in different individuals
- HeveaHevea is a genus of flowering plants in the spurge family, Euphorbiaceae, with about ten m
- Hevea brasiliensisMost common rubber tree
- HibisceaeHibisceae is a tribe of flowering plants in the mallow family Malvaceae, subfamily Malvoid
- HibiscusGenus of plants
- HierochloeHierochloe is a genus of plants in the grass family known generally as sweetgrass. These a
- HillebrandiaHillebrandia sandwicensis is a species of a herbaceous perennial flowering plant native to
- Hipólito Ruiz LópezHipólito Ruiz López (August 8, 1754 in Belorado, Burgos, Spain – 1816 in Madrid), or Hipól
- Hiroshige IIHiroshige II (二代目 歌川広重, Ni-daime Utagawa Hiroshige, 1826 – 17 September 1869) was a Japane
- HirticlavulaHirticlavula is a fungal genus in the family Clavariaceae. It contains a single described
- Histoplasma capsulatumSpecies of fungus
- History of chromatographyThe history of chromatography spans from the mid-19th century to the 21st. Chromatography,
- HodophilusHodophilus is a genus of agarics (gilled fungi) in the family Clavariaceae. Basidiocarps (
- HollyGenus of flowering plants
- HologenomicsHologenomics is the omics study of hologenomes. A hologenome is the whole set of genomes o
- HolozoaClade containing animals and some protists
- HomothallismGenetic trait in fungi and algae
- HoneycrispApple cultivar
- Honeydew (melon)Melon cultivar
- HoneysuckleGenus of flowering plants
- HoodiaHoodia (; known locally as "ghaap" or "bobbejaanghaap") is a genus of flowering plants in
- HopsFlower used to flavour beer and other beverages
- Hordeum chilenseHordeum chilense is a species of wild barley native to Chile and Argentina. A diploid, it
- HornbeamGenus of flowering plants
- HorneophytopsidaThe Horneophytopsida, informally called horneophytes, are a class of extinct plants which
- Hort.Hort., in the taxonomy of plants, is an abbreviation used to indicate a name that saw sign
- HortaeaGenus of fungi
- Hortiboletus rubellusSpecies of fungus
- Hot tub folliculitisHot tub folliculitis, also called Pseudomonal folliculitis or Pseudomonas aeruginosa folli
- HouseplantOrnamental plant in a home or office
- HowittiaHowittia is a genus of plant containing the single species, Howittia trilocularis, commonl
- HuckleberryBerry and plant
- HuerniaThe genus Huernia (family Apocynaceae, subfamily Asclepiadoideae) consists of perennial, s
- Human interactions with fungiOverview of human–fungi interactions
- Human viromeThe human virome is the total collection of viruses in and on the human body. Viruses in t
- Humphry MarshallHumphry Marshall (October 10, 1722 – November 5, 1801) was an American botanist and plant
- Humulus lupulusSpecies of flowering plant
- HuskOuter shell or coating of a seed
- HyacinthGenus of flowering plants
- HyacinthoidesHyacinthoides is a genus of flowering plants in the family Asparagaceae, known as bluebell
- HyaloriaceaeFamily of fungi
- HyaloscyphaHyaloscypha is a genus of fungi in the family Hyaloscyphaceae.
- HyaloscyphaceaeFamily of fungi
- Hybrid tea roseHybrid tea is an informal horticultural classification for a group of garden roses. The fi
- Hybridization in perennial plantsHybridization, when new offspring arise from crosses between individuals of the same or di
- HydnaceaeFamily of fungi
- HydnangiaceaeFamily of fungi
- HydnellumGenus of fungi in the family Bankeraceae
- Hydnellum ferrugineumSpecies of fungus
- Hydnellum peckiiSpecies of fungus
- Hydnellum suaveolensHydnellum suaveolens, commonly known as the fragrant hydnellum mushroom, is an inedible fu
- Hydnoid fungiGroup of fungi
- HydnumGenus of fungi
- Hydnum repandumSpecies of edible fungus of the family Hydnaceae distributed in Europe
- HydrangeaGenus of flowering plants
- Hydrangea arborescensHydrangea arborescens, commonly known as smooth hydrangea or sevenbark, is a species of fl
- HydrangeaceaeHydrangeaceae is a family of flowering plants in the order Cornales, with a wide distribut
- HygrocybeGenus of fungi
- Hygrocybe aurantiosplendensHygrocybe aurantiosplendens, commonly known as the orange waxcap, is a gilled fungus in th
- Hygrocybe chlorophanaSpecies of fungus
- Hygrocybe citrinovirensHygrocybe citrinovirens is a species of agaric (gilled mushroom) in the family Hygrophorac
- Hygrocybe coccineaSpecies of fungus
- Hygrocybe conicaSpecies of fungus
- Hygrocybe miniataSpecies of fungus
- Hygrocybe puniceaSpecies of fungus
- Hygrocybe splendidissimaHygrocybe splendidissima, is a species of agaric (gilled mushroom) in the family Hygrophor
- HygrophoraceaeFamily of fungi
- HygrophoropsidaceaeThe Hygrophoropsidaceae are a family of mushrooms that are gilled in appearance but lie wi
- Hygrophoropsis aurantiacaSpecies of fungus in the family Hygrophoropsidaceae
- HygrophorusGenus of fungi
- Hygrophorus agathosmusSpecies of fungus
- HymeneliaceaeHymeneliaceae is a family of lichen-forming fungi in the order Baeomycetales. It contains
- HymeniumSpore-bearing tissue layer in fungi
- HymenochaetalesOrder of fungi
- HymenogastraceaeFamily of fungi
- Hymenoscyphus fraxineusFungus, cause of ash dieback
- HyoscyamusHyoscyamus — known as the henbanes — is a genus of flowering plants in the nightshade fami
- Hyoscyamus nigerSpecies of plant
- HypericaceaeHypericaceae is a plant family in the order Malpighiales, comprising six to nine genera an
- Hypericum perforatumFlowering plant in the St John's wort family
- HypholomaGenus of fungi
- Hypholoma fasciculareSpecies of fungus
- Hypholoma lateritiumSpecies of fungus
- HyphomycetesGroup of fungi
- HypocreaceaeThe Hypocreaceae are a family within the class Sordariomycetes. Species are recognisable b
- HypocrealesOrder of fungi
- HypocreomycetidaeHypocreomycetidae is a subclass of sac fungi.
- Hypogymnia physodesSpecies of lichen in the family Parmeliaceae
- HypomycesGenus of fungi
- Hypomyces chrysospermusFungal parasite of bolete mushrooms
- Hypomyces lactifluorumSpecies of edible parasitic fungus
- HyponectriaceaeThe Hyponectriaceae are a family of fungi, that was formerly in the order Xylariales. It w
- HypotrachynaHypotrachyna is a genus of lichenized fungi within the family Parmeliaceae. According to t
- HypoxylonGenus of fungi
- Hypoxylon fragiformeHypoxylon fragiforme is a multiperitheciate carbonaceous pyrenomycete known from Europe an
- Hypsizygus tessulatusSpecies of mushroom-forming fungus
- Hyssopus (plant)Hyssopus (hyssop) is a genus of herbaceous or semi-woody plants in the family Lamiaceae, n
- Hyssopus officinalisSpecies of plant
- HysteriaceaeFamily of fungi
- HysteriumHysterium is a genus of fungi belonging to the family Hysteriaceae.
- HysterographiumHysterographium is a genus of fungi of uncertain placement in the class Dothideomycetes. I