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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
Thelotrema saxatile C.Knight

Trans. & Proc. New Zealand Inst. 8: 327 (1876)

Leptotrema saxatile (C.Knight) Müll.Arg., Bull. Soc. Roy. Bot. Belgique 31: 35 (1892); — Leptotrema monosporum var. saxatile (C.Knight) Müll.Arg., Bull. Herb. Boissier 2, App. 1: 75 (1894).

T: New Zealand, [?Wellington], 1 Feb. 1882, C.Knight s.n.; lecto: WELT, Herb. Knight [36: 12], fide D.J.Galloway, Flora of New Zealand Lichens 577 (1985); isolecto: BM.

Ascidium manosporum C.Knight, Trans. New Zealand Inst. 15: 355 (1883); Leptotrema manosporum (C.Knight) Müll.Arg., Bull. Herb. Boissier 2, App. 1: 75 (1894); Thelotrema manosporum (C.Knight) Hellb., Bih. Kongl. Svenska Vetensk.-Akad. Handl. 21(13): 78 (1896) [the epithet was corrected to A. monosporum by D.J.Galloway (Flora of New Zealand Lichens 575, 1985). However, it was published as A. manosporum]. T: New Zealand, [?Wellington], C.Knight s.n.; lecto: WELT, Herb. Knight [37A: 1], fide D.J.Galloway, loc. cit.

Thelotrema monosporoides Nyl., Lich. Nov. Zel. 76 (1888); Thelotrema monosporum Kremp., Verh. Zool.-Bot. Ges. Wien 26: 453 (1876), nom. illeg., non T. monosporum Nyl.; Leptotrema monosporoides (Nyl.) Müll.Arg., Bull. Herb. Boissier 2, App. 1: 75 (1894); Ocellularia monosporoides (Nyl.) Hale, Mycotaxon 11: 137 (1980). T: New Zealand, [?Wellington], C.Knight s.n.; lecto: H-NYL 22708, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 314 (1981).

Thelotrema monospermum R.C.Harris, Some Florida Lichens 99 (1990). T: Liberty Co., Florida, U.S.A., R.C.Harris 11399; holo: NY.


  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale yellowish brown to pale greyish green or whitish grey, dull to somewhat glossy, usually smooth, continuous to verrucose or verruculose, rimose or not. Protocortex continuous or discontinuous, to 25 µm thick, rarely becoming conglutinated and forming a thin true cortex of periclinal hyphae. Algal layer poorly to well developed, continuous or discontinuous; calcium oxalate crystals sparse to abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous or not, to 0.8 mm diam., ±rounded, perithecioid to predominantly apothecioid, sessile, solitary to marginally fused, immersed to more often ±distinctly emergent, irregular-hemispherical to urceolate or ±subglobose. Disc often becoming partly visible from above, pale greyish to grey, moderately to strongly pruinose. Pores small to gaping, to c. 0.6 mm diam., ±rounded to irregular, the proper exciple completely to apically visible from above, entirely free, usually off-white, often shrunken, usually incurved, rarely erect. Thalline rim margin thin to thick, ±rounded to irregular, small to gaping, entire to ±distinctly split to somewhat lacerate or eroded, incurved to occasionally erect, concolorous with the thallus to brownish, rarely paler than the thallus. Proper exciple ±free, thin to thick, hyaline to pale yellowish internally, yellowish brown marginally, apically, often brownish to dark brown and covered by dark grey granules, occasionally amyloid at the base. Hymenium to c. 250 µm thick, not inspersed, moderately conglutinated; paraphyses parallel or slightly interwoven, unbranched, the tips moderately to markedly thickened; lateral paraphyses often inconspicuous, to c. 20 µm long; columellar structures absent. Epihymenium hyaline, with fine to coarse greyish granules and small crystals. Asci 1 (–2)-spored; tholus thin or not visible. Ascospores muriform, cylindrical to oblong-ellipsoidal, with ±rounded to narrowly rounded ends, brown at early maturity, very large ascospores often with persistently hyaline tips, non-amyloid, 70–180 (–200) × 15–40 µm, with c. 24–46 × 2–10 locules; locules ±rounded to slightly angular, subglobose to ±oblong; transverse septa thin, distinct, regular; ascospore wall often initially thick, thin at maturity, non-halonate; endospore thin. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  A rare, corticolous species in lowland to montane rainforest in eastern Qld; also on Lord Howe Island. Known from the U.S.A. and New Zealand (where it is saxicolous and corticolous).  
  Mangold et al. (2009)  

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

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