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 | ||
| Leptotrema wightii (Taylor) Müll.Arg. | ||
Flora 65: 499 (1882) Endocarpon wightii Taylor, London J. Bot. 6: 155 (1847); — Thelotrema wightii (Taylor) Nyl., Mém. Soc. Sci. Cherbourg 5: 118 (1857); — Phaeotrema wightii (Taylor) Zahlbr., in H.Magnusson & A.Zahlbruckner, Ark. Bot. 31A(6): 48 (1944); — Myriotrema wightii (Taylor) Hale, Mycotaxon 11: 135 (1980). T: Madras, India, R.Wight s.n.; lecto: FH-TAYL, fide M.E.Hale, Smithsonian Contr. Bot. 16: 43 (1974); isolecto: BM, G. Endocarpon baileyi Stirt., Trans. & Proc. Roy. Soc. Victoria 17: 74 (1881); Leptotrema baileyi (Stirt.) Shirley, Proc. Roy. Soc. Queensland 6: 194 (1889). T: Brisbane, Qld, 1878, F.M.Bailey 249;holo: GLAM; iso: BRI. Thelotrema ravenelii Tuck., Amer. J. Arts Sci, ser. 2, 25: 426 (1858); Leptotrema ravenelii (Tuck.) Fink, Lichen Fl. United States 133 (1935). T: South Carolina, U.S.A., H.W.Ravenel 151; lecto: FH-TUCK, fide G.Salisbury, Portugaliae Acta Biol., ser. B, 11: 35 (1971); isolecto: NY, US. Thelotrema subconcretum Leight., Trans. Linn. Soc. London 27: 169 (1869); Phaeotrema subconcretum (Leight.) Müll.Arg., Mém. Soc. Phys. Genève 29(8): 10 (1887); Leptotrema subconcretum (Leight.) Müll.Arg., Nuovo Giorn. Bot. Ital. 23: 277 (1891). T: Central Province, Ceylon [Sri Lanka], G.H.K.Thwaites 89; lecto: BM, fide M.E.Hale, Smithsonian Contr. Bot. 16: 43 (1974). |
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| Thallus epiphloeodal, bulging and flaking away from the substratum, to c. 1 mm thick, pale greenish grey, dull, smooth, continuous, finely reticulate, forming a grainy-speckled pattern, usually not rimose, rarely sparingly rimose. Protocortex ±continuous, to c. 20 µm thick. Algal layer well developed and continuous, becoming discontinuous due to crystal inclusions; calcium oxalate crystals abundant, large, clustered, forming columns. Medulla with conspicuous bright red anthraquinone crystals. Basal part of the thallus occasionally consisting of strongly conglutinated hyphae, forming a lower cortex-like layer. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.6 mm diam., ±rounded, perithecioid to apothecioid, mostly solitary, immersed. Disc usually not visible from above, rarely becoming partly visible, pale to dark brown, epruinose. Pores small to broad, rarely gaping, to c. 0.4 mm diam., in mature ascomata formed by the proper exciple, rounded to slightly irregular, with an entire margin; apical proper exciple becoming ±visible from above, forming a fused to somewhat free inner pore margin, incurved and usually ±sunken, bright-translucent to off-white. Thalline rim margin thick, entire, often brighter than the thallus. Proper exciple mainly fused to slightly detached, becoming distinctly free only in old gaping ascomata, thick, hyaline internally to yellowish or orange-brown marginally, occasionally incorporating greyish granules, non-amyloid. Hymenium to c. 250 µm thick, strongly conglutinated; paraphyses straight to slightly bent, parallel to somewhat interwoven, sparingly branched towards the apical hymenium. Epihymenium hyaline, occasionally with fine greyish granules. Ascospores submuriform to muriform, subglobose to oblong or, rarely, ellipsoidal, the ends mostly rounded, becoming brown at early maturity, non-amyloid to faintly amyloid, 10–30 × 8–15 µm, with 3–6 × 1–4 locules; locules ±rounded to angular, mostly irregular; septa becoming thin, irregular or often with a central more distinct septum; ascospore wall initially thick, remaining thick or becoming thin; endospore thin. Pycnidia not seen; according to Frisch et al. (2006) immersed in the thallus or in thalline warts. Conidia bacilliform, 5–7 × 1.0–1.2 µm. CHEMISTRY: Thallus K–, with K+ purple crystals, C–, P–; containing an unknown anthraquinone (RF-values 33/14/14 in solvent systems A/B’/C). |
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| Common on the bark of trees and shrubs (often overgrowing adjacent mosses) in eastern Qld and north-eastern N.S.W., from sea level to 1000 m; usually in seasonally wet areas such as monsoon scrub and forest on river flats, rarely in rainforest. Mainly pantropical. | ||
| Mangold (2009) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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