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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
Trichothelium assurgens (Cooke) Aptroot & Lücking
  Mycol. Res. 105: 511 (2001). Trichothelium nanum Malcolm & Vězda, Folia Geobot. Phytotax. 30: 95 (1995). T: York Valley, Nelson, South Island, New Zealand, 16 Nov. 1993, W.Malcolm 1569; holo: CHR; iso: Herb. A. Vězda.  
  Thallus forming small round or irregular patches, these frequently confluent, pale greenish grey to medium green, occasionally pale grey (and moribund?), smooth, matt to slightly glossy; prothallus not apparent. Algae Phycopeltis; cells subglobose, angular-rounded or shortly rectangular, not forming radiating plates. Perithecia superficial, hemispherical to subglobose, 0.08–0.16 (–0.2) mm diam., black; setae (2–) 4–6 (–8), usually narrowly acute (occasionally hair-like), decurved and usually soft, occasionally irregularly sinuous, usually remaining discrete, usually whitish, sometimes basally black, or with the proximal half to two-thirds black. Involucrellum greenish black to brown-black in thin section, contiguous with the exciple. Exciple c. 10 µm thick, greenish black to brown-black. Asci elongate-cylindrical to narrowly obclavate, 55–85 × 8–10 µm. Ascospores oblong to fusiform or bacilliform, 3-septate, 15–20 (–25) × 3–4 (–5) µm; perispore not apparent. Pycnidia not seen. Trichothelium assurgens map
  A very inconspicuous but probably common species, known from north-eastern Qld, south-eastern N.S.W., Vic. and Tas. Also in Micronesia, Melanesia, Polynesia and New Zealand. Foliicolous.  
  McCarthy (2001b)  

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

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