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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 subtile Tuck.

Amer. J. Arts Sci., ser. 2, 25: 426 (1858)

Ocellularia subtilis (Tuck.) Riddle, Mycologia 15: 79 (1923).

T: Brattleboro, Vermont, U.S.A., 1851, Frost 150 p.p.; lecto: FH-TUCK, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 658 (2009); isolecto: NY.

Ocellularia jugalis Müll.Arg., Bull. Herb. Boissier 3: 313 (1895). T: Sankeys Scrub, [Brisbane], Qld, 1893, J.Shirley 1836; holo: G; iso: BRI (AQ721220).

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale yellowish brown to pale greyish or tan-grey, dull to slightly glossy, smooth, verrucose to verruculose or continuous, rimose or not. Protocortex discontinuous, to c. 25 µm thick, occasionally becoming conglutinated and forming a true cortex of periclinal hyphae. Algal layer poorly to well developed, continuous or discontinuous; calcium oxalate crystals abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 0.6 mm diam., ±rounded to somewhat irregular, apothecioid, sessile, solitary to marginally or rarely completely fused, mostly ±distinctly emergent, hemispherical to urceolate or subglobose, the surface more distinctly verruculose than the thallus. Disc usually becoming partly visible from above in older ascomata, grey, ±distinctly whitish-pruinose. Pores small to gaping, to c. 0.4 mm diam., ±rounded to irregular, entire to slightly split, the proper exciple apically to more often completely visible from above, apically pale, brownish towards the base, occasionally shrunken, incurved to somewhat erect. Thalline rim margin thin to thick, usually becoming wide to gaping, entire to split, rarely somewhat eroded, ±rounded to irregularly rounded, mostly incurved and concolorous with thallus. Proper exciple free, thick, hyaline to largely pale yellowish internally, yellowish to greyish brown marginally, apically often dark brown, sometimes with substratum inclusions, rarely amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, distinctly conglutinated; paraphyses parallel to slightly interwoven, usually unbranched, the tips irregular, thickened; lateral paraphyses usually inconspicuous, to c. 25 µm long; columellar structures absent. Epihymenium hyaline or becoming brownish, usually with fine greyish brown granules and small crystals. Asci 4–8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, oblong-fusiform to clavate, the ends ±rounded to acute, hyaline, post-mature or decaying ascospores brownish, faintly to moderately amyloid, 30–50 × 7–10 µm, with 8–16 locules; locules ±rounded to slightly angular, rarely subglobose to lentiform; end cells hemispherical to conical; septa thick, regular; ascospore wall thick, thinly halonate, often crenate. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  A rare, corticolous species in cool-temperate rainforest and wet-sclerophyll forest in Vic. and Tas.; also in south-eastern Qld. Occurs at altitudes of 250–500 m; pantemperate.  
  Mangold et al. (2009)  

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

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