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Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Collema pustulatum Ach.
  Syn. Meth. Lich. 317 (1814)
T: northern America, Muehlenberg; lecto: UPS, n.v., fide G.Degelius, Symb. Bot. Upsal. 20(2): 74 (1974).
  Thallus to 1.5 cm wide, foliose to subfruticose, loosely adnate or ascending, subumbilicate, deeply lobate, smooth, matt, without isidia, olive-green. Lobes to 4 mm wide, few, rounded or extended, discrete or imbricate, undivided, flat or concave; lobules few to numerous. Apothecia dense, small, 0.3–0.4 mm wide, laminal, immersed becoming slightly raised, subglobose or flattened; disc flat to slightly concave, glossy, epruinose, red to dark red; thalline exciple thin, entire, smooth, sometimes lobulate, prominent, persistent. Asci 65–90 × 15–24 µm. Ascospores 20–40 × 11–15 µm, ellipsoidal, ovoid or subglobose, muriform with 3 transverse septa, sometimes slightly constricted at septa. Pycnidia not seen.
  Occurs mainly on calcareous rocks in temperate and tropical areas of North and South America, and the West Indies; rare in Qld and N.S.W.  
  Filson (1992d)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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