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Hypotrachyna spp.
Family: Parmeliaceae
Hypotrachyna image
Stephen Sharnoff  
Life habit: lichenized Thallus: tightly to loosely adnate, foliose, often dichotomously lobate lobes: usually sublinear, sometimes subirregular or linear-elongate, sometimes imbricate; axils: sinuous or V-shaped; lobe tips: usually subtruncate, but sometimes rounded, incised or not, cilia absent or rarely short ciliate upper surface: gray, ivory or yellow green, smooth, plane to rugulose, shiny or dull, sometimes white maculate, usually epruinose, pseudocyphellae absent upper cortex: pored epicortex, palisade paraplectenchymatous medulla: white or rarely partially yellow or orange, cell walls containing isolichenan photobiont: primary one a Trebouxia, secondary photobiont absent lower surface: black, sometimes with brown tips, plane to sometimes wrinked, rarely subcanaliculate, attachment by dichotomous rhizoid holdfasts, without cyphellae, pseudocyphellae or tomentum Ascomata: apothecial, imperforate, laminal, orbicular, cup-shaped, sessile or subpedicellate; margin: prominent with thalloid rim; exciple: gray or hyaline; epithecium: brown or brownish yellow; hypothecium: hyaline asci: lecanoral, apex I+ blue, with wide, axial body divergent towards apex, 8-spored ascospores: simple, ellipsoid to broadly ellipsoid; wall: thin, hyaline Conidiomata: pycnidial, laminal to marginal, immersed conidia: bacilliform or weakly bifusiform, 5-8 x 1 µm Secondary metabolites: upper cortex with either atranorin and chloroatranorin (gray), lichexanthone (ivory), or usnic acid (yellow-green); medulla with some combination of orcinol depsides, orcinol depsidones, ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, rarely triterpenoids, anthraquinones, xanthones, and dibenzofurans Geography: predominantly tropical, montane to subalpine, but some species also occurring in temperate areas (particularly in maritime influenced regions) Substrate: mostly on bark or acidic rocks, rarely on compacted soil. Notes: Although all the species in the Sonoran region are gray and have atranorin or rarely lichexanthone or isousnic acid in the upper cortex, there are a few yellow species, particularly in the tropics, with usnic acid in the upper cortex. Previously Hypotrachyna was treated as a section of Parmelia by Vainio (1890) and later raised to a subgenus (Hale and Kurokawa 1964). As it became clear that this large, predominately tropical group of lichens was quite different from the temperate to arctic Parmelia s.s, it was finally raised to the genus level (Hale 1974a), a status that is widely recognized today. Key characters for the genus include subtruncate lobe apices, lack of marginal cilia, dichotomously branched rhizines and bifusiform conidia.
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Image of Hypotrachyna adducta
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Image of Hypotrachyna adjuncta
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Image of Hypotrachyna africana
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Image of Hypotrachyna americana
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Image of Hypotrachyna arsenei
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Image of Hypotrachyna awasthii
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Hypotrachyna
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Image of Hypotrachyna brueggeri
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Image of Hypotrachyna cendensis
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Image of Hypotrachyna citrella
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Image of Hypotrachyna cleefii
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Hypotrachyna
Image of Hypotrachyna coorgiana
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Image of Hypotrachyna cryptochlora
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Image of Hypotrachyna dodapetta
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Image of Hypotrachyna ectypa
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Image of Hypotrachyna evansii
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Image of Hypotrachyna habenula
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Image of Hypotrachyna heterochroa
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Image of Hypotrachyna ikomae
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Image of Hypotrachyna incognita
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Image of Hypotrachyna jamesii
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Image of Hypotrachyna kaernefeltii
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Image of Hypotrachyna keitauensis
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Image of Hypotrachyna kinabalensis
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Image of Hypotrachyna latiloba
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Image of Hypotrachyna ligulata
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Image of Hypotrachyna lipidifera
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Image of Hypotrachyna malesiana
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Image of Hypotrachyna massartii
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Image of Hypotrachyna mexicana
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Image of Hypotrachyna meyeri
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Image of Hypotrachyna monilifera
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Hypotrachyna
Image of Hypotrachyna neodamaziana
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Image of Hypotrachyna neoflavida
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Image of Hypotrachyna neohalei
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Image of Hypotrachyna neotropica
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Image of Hypotrachyna nepalensis
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Image of Hypotrachyna nigrociliata
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Image of Hypotrachyna nodakensis
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Image of Hypotrachyna novella
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Image of Hypotrachyna obscurella
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Image of Hypotrachyna paramensis
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Image of Hypotrachyna peruviana
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Image of Hypotrachyna primitiva
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Hypotrachyna
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Image of Hypotrachyna revolutella
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Image of Hypotrachyna rigidula
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Image of Hypotrachyna schindleri
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Image of Hypotrachyna scytodes
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Image of Hypotrachyna singularis
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Image of Hypotrachyna sorocheila
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Image of Hypotrachyna subformosana
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Image of Hypotrachyna subplana
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Image of Hypotrachyna subplumbeata
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Image of Hypotrachyna subvexans
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Image of Hypotrachyna tariensis
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Image of Hypotrachyna thryptica
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