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Alectoria
Family: Parmeliaceae
Alectoria image
Erin Tripp
  • Greater Sonoran Desert
  • Resources
Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Life Habit: lichenized Thallus: fruticose, erect, decumbent (prostrate), subpendent or pendent, markedly elongate, attached by a basal holdfast; branches: ± terete, or occasionally somewhat expanded and dorsiventrally compressed, or angular to foveolate towards the base and at branch axils surface: greenish yellow or occasionally streaked greenish-black, or in one species (A. nigricans) grayish to pinkish or brown-black, continuous, generally smooth, occasionally becoming striately ridged towards base and axils; pseudocyphellae: always present, often conspicuous, fusiform, white, flat to markedly raised; soredia: present or absent; isidia: absent (but pseudocyphellae becoming sorediate and bearing spinules in one species); true lateral spinules: absent cortex: composed of longitudinal, periclinal, arachnoid, conglutinated hyphae immersed in ± large amount of matrix medulla: loose, arachnoid; hyphae: longitudinal, distinctly segmented, usually ornamented; cell walls with isolichenan, Cetraria-type lichenan, and sometimes traces of intermediate types of lichenan photobiont: primary one a trebouxioid alga, secondary photobiont absent Ascomata: apothecial, lateral, sometimes appearing geniculate owing to the death of the branch distal to them, sessile, slightly stalked, circular; thalline exciple: persistent and often markedly incurved, concolorous with thallus; disc: concave, brown to dark brown or black; exciple: gray or hyaline; hymenium: hyaline below, brown, green, blue-green, gray above, I+ very strongly blue; paraphyses: 1.5-3 micro meters wide, somewhat branched and anastomosing, the tips weakly pigmented, 70-140 micro meters; hypothecium: hyaline or pale, 20-40 micro meters, over an algal layer asci: clavate-oval, 65-130 x 25-50 micro meters, Lecanora-type; wall: 6-12 micro meters thick; tholus: I+ blue, the ocular chamber and axial body short and broad, 2-4 (-8)-spored ascospores: simple, broadly ellipsoid, 20-45 x 12-25 micro meters; wall: 3-4 micro meters thick, at first hyaline, becoming pale brownish, grayish to dark brownish or blackish at maturity, smooth, with distinct, pale, gelatinous outermost layer, I- Conidiomata: pycnidial, usually rare, (sub-) marginal-(sub-)terminal, immersed in thalloid warts conidia: bacilliform, pleurogenously formed, 7-8 x 0.8 micro meters Secondary metabolites: cortex usually with usnic acid (except in A. nigricans); medulla and/or cortex often with orcinol and ß-orcinol depsides and depsidones and an unidentified K+ red, C+ green-black metabolite occurs in the cortex of the basal parts of the thalli of most species Geography: circumbipolar, arctic-alpine to boreal-montane Substrate: on bark, wood, soil, or detritus. Notes: Alectoria is readily separable from other genera, including Bryoria and Pseudephebe, by its characteristic yellow-green color (due to usnic acid) in most species, the cortical structure and the abundance and structure of the pseudocyphellae. It differs from most species of Usnea (which are also yellow green due to usnic acid) by the lack of a central strand. According to Tucker and Jordan (1978), the reports of A. ochroleuca (Hoffm.) A. Massal. from southern California by (Orcutt 1907 & 1909, as Usnea ochroleuca Fr.) and Hasse (1913) are based on misidentifications (presumably not species of Alectoria at least in the modern, more restricted sense).
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Alectoria acanthodes
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Alectoria albida
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Alectoria anceps
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Alectoria angolensis
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Alectoria antarctica
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Alectoria arabum
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Alectoria arctica
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Alectoria arenaria
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Alectoria asiatica
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Alectoria australiensis
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Alectoria berengeriana
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Alectoria biformis
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Alectoria brodoana
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Alectoria canariensis
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Alectoria carpatica
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Alectoria catharinae
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Alectoria ciliata
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Alectoria cincinata
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Alectoria confusa
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Alectoria congesta
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Alectoria cornicularioides
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Alectoria corymbosa
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Alectoria crinalis
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Alectoria crispa
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Alectoria csarnagurensis
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Alectoria curta
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Alectoria dahlii
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Alectoria degenii
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Alectoria dichotoma
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Alectoria divaricata
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Alectoria divergescens
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Alectoria ecuadorensis
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Alectoria fallacina
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Alectoria flexuosa
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Alectoria forissi
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Alectoria forissii
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Alectoria funiformis
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Alectoria furcellata
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Alectoria fuscesens
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Alectoria fuscidula
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Alectoria fusconitida
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Alectoria glauca
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Alectoria gracilis
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Alectoria guatemalana
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Alectoria himalayana
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Alectoria himalayensis
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Alectoria imshaugii
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Alectoria indonesica
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Alectoria intricata
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Alectoria japonica
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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