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North American Lichen Herbaria
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Stereocaulon
Family: Stereocaulaceae
Stereocaulon image
Stephen Sharnoff  
  • Greater Sonoran Desert
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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, occasionally reduced and more crust-like, attached by the whole lower surface or by basal holdfasts surface: grayish, ochraceous-yellowish, olivaceous, brownish, rose or white, contiguous or granular-farinose to spongiose-filamentous, with or without tomentum photobiont: primary one a chlorococcoid alga, secondary photobiont a cyanobacterium (Nostoc or Stigonema or occasionally Scytonema or Chroococcus) usually present in cephalodia on the pseudopodetia; cephalodia: mostly irregularly globose lower surface: tomentose to glabrous primary thallus: usually rudimentary and disappearing early but in some species persistent, composed of basal granular or squamule-like structures (phyllocladia) Pseudopodetia: solid, ± terete, weakly to strongly branched, fruticose in appearance, usually corticate; central axis: cartilaginous, composed of thick-walled, longitudinal hyphae secondary thallus: shrubby, erect to decumbent, composed of stalks (pseudopodetia), developing from a ± well-developed holdfast in some species, phyllocladia: or phyllocladioid branchlets: verrucose to granular, cylindrical, squamulose or foliose, containing the algae and a loosely interwoven medulla, sometimes appearing dorsiventral; with or without soredia Ascomata: apothecial, terminal or lateral, roundish, sessile or substipitate or stipitate; disc: plane to often convex, pale brown to red-brown, dark brown or black, without a thalline margin; exciple: prominent (raised) to ± soon disappearing, sometimes pale and appearing almost thalloid; hymenium: hyaline below, brown, or ochraceous-yellowish above; paraphyses: unbranched, not (or scarcely) anastomosing, apices mainly with a brown cap; hypothecium: hyaline or ochraceous-yellowish (to brown in some species) asci: clavate to cylindrical, unitunicate, tholus I+ blue; in K/I with a blue outer layer, and a blue apical dome with a ± central, darker blue tube, c. 8-spored ascospores: ellipsoid, hyaline, clavate, or fusiform to cylindrical, acicular, or vermiform, transversely 1-13 septate, (12-) 16-100 (-200) x 2-7 µm, hyaline, smooth, thin walled, without distinctly developed endospore thickening, I- Conidiomata: sometimes present, terminal or lateral, immersed in the tips of phyllocladia, ovoid to spherical, darkened around ostiole conidia: formed acrogenously, filiform to cylindrical, straight or curved, simple Secondary metabolites: orcinol and beta-orcinol depsides, orcinol and beta-orcinol depsidones and aliphatic acids Geography: arctic-alpine, boreal and montane regions of Northern and Southern Hemispheres Substrate: on soil, bryophytes, detritus, or non-calciferous, siliceous rock; in cool to cold, humid areas. Notes: The genus is not likely to be confused with any other, except perhaps Leprocaulon, which has very fine, ecorticate branches and lacks ascomata.
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Species within inventory project: || << 101 - 150 taxa >>
Stereocaulon fibrillosum
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Stereocaulon fibula
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Stereocaulon flabellatum
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Stereocaulon flavireagens
Image of Stereocaulon flavireagens
Stereocaulon foliiforme
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Stereocaulon foliolosum
Image of Stereocaulon foliolosum
Stereocaulon follmannii
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Stereocaulon formosanum
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Stereocaulon fronduliferum
Image of Stereocaulon fronduliferum
Stereocaulon fungiforme
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Stereocaulon furcatum
Image of Stereocaulon furcatum
Stereocaulon furfuraceum
Image of Stereocaulon furfuraceum
Stereocaulon giltayi
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Stereocaulon glabrum
Image of Stereocaulon glabrum
Stereocaulon glareosum
Image of Stereocaulon glareosum
Stereocaulon glaucescens
Image of Stereocaulon glaucescens
Stereocaulon globisorum
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Stereocaulon gracilescens
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Stereocaulon gracilius
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Stereocaulon gracillimum
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Stereocaulon graminosum
Image of Stereocaulon graminosum
Stereocaulon grande
Image of Stereocaulon grande
Stereocaulon granulans
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Stereocaulon granulosum
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Stereocaulon gregarium
Image of Stereocaulon gregarium
Stereocaulon groenlandicum
Image of Stereocaulon groenlandicum
Stereocaulon halei
Image of Stereocaulon halei
Stereocaulon haumanianum
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Stereocaulon heardii
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Stereocaulon himalayense
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Stereocaulon hokkaidense
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Stereocaulon humbertii
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Stereocaulon humile
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Stereocaulon hypopetraeum
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Stereocaulon implexum
Image of Stereocaulon implexum
Stereocaulon incrustatum
Image of Stereocaulon incrustatum
Stereocaulon intermedium
Image of Stereocaulon intermedium
Stereocaulon intricatum
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Stereocaulon japonicum
Image of Stereocaulon japonicum
Stereocaulon kangdingense
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Stereocaulon karisimbiense
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Stereocaulon klondikense
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Stereocaulon kotiluotënse
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Stereocaulon laccatum
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Stereocaulon lambii
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Stereocaulon laseroni
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Stereocaulon lavicola
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Stereocaulon lecanoreum
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Stereocaulon leporinum
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Stereocaulon leprocauloides
Image of Stereocaulon leprocauloides

This project made possible by National Science Foundation Awards: #1115116