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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 diplotrema Nyl.

Ann. Sci. Nat., Bot., sér. 4, 11: 258 (1859)

Ocellularia diplotrema (Nyl.) Zahlbr., Cat. Lich. Univ. 2: 588 (1923).

T: “Insula Borbonia” [Réunion], coll. unknown; lecto: H-NYL 22737, fide M.E.Hale (in herb., 1972).

Ocellularia turgidula Müll.Arg., J. Bot. 7: 94 (1893); Thelotrema turgidulum (Müll.Arg.) Hale, Mycotaxon 11: 132 (1980), nom. illeg., non Thelotrema turgidulum Vain. T: Mt Mou, New Caledonia, 1870, B.Balansa s.n.; lecto: PC, fide M.E.Hale, Smithsonian Contr. Bot. 38: 33 (1978); isolecto: G.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale greenish grey to pale olive, usually dull, rarely slightly glossy, smooth to uneven, occasionally porous, continuous to ±distinctly verrucose or verruculose, rimose. Cortical structures absent, or the thallus with a discontinuous protocortex to c. 20 µm thick. Algal layer well developed, continuous or discontinuous; calcium oxalate crystals small, numerous, often clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.4 (–0.7) mm diam., ±rounded to slightly irregular, apothecioid, solitary to marginally or completely fused, immersed to emergent, then depressed-hemispherical to depressed-urceolate. Disc often becoming partly visible from above, pale greyish to pale flesh-coloured, epruinose to slightly pruinose. Pores to c. 0.15 mm diam., ±rounded to slightly irregular, entire to split, apex of the proper exciple visible from above, often only slightly separated from the thalline rim margin, rarely somewhat shrunken, off-white, pale brownish towards the base, incurved to somewhat erect. Thalline rim margin thin to thick, predominantly entire, ±rounded to irregularly rounded, becoming rather broad, incurved, rarely somewhat erect, concolorous with the thallus, occasionally brownish. Proper exciple becoming apically to partly free, rarely completely free, thin to thick, hyaline to pale yellowish internally, brownish or yellowish brown marginally, apically often dark brown, often amyloid at the base. Hymenium to c. 180 µm thick, not inspersed, moderately conglutinated; paraphyses ±interwoven, unbranched, the tips moderately to strongly thickened; lateral paraphyses mostly inconspicuous, to c. 30 µm long; columellar structures absent. Epihymenium hyaline, with greyish or brownish granules and small crystals. Asci 4–8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, rarely with a single longitudinal septum, mostly ±fusiform, the ends ±rounded, rarely subacute, hyaline, strongly amyloid, 50–90 (–110) × 8–12 µm, with 14–20 (–22) × 1 (–2) locules; locules ±rounded, subglobose to lentiform or somewhat irregular; end cells hemispherical to conical; septa thick, regular to slightly irregular; ascospore wall thick, often slightly crenate, thinly halonate. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Common on bark in eastern Qld and eastern N.S.W.; occurs in rainforest and wet-sclerophyll forest at altitudes to 1100 m. Mainly pantropical.  
  Mangold et al. (2009)  

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

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