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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
Myriotrema myrioporum (Tuck.) Hale

Mycotaxon 11: 134 (1980)

Thelotrema myrioporum Tuck., Proc. Amer. Acad. Arts Sci. 5: 412 (1862); — Ocellularia myriopora (Tuck.) Müll.Arg., Rev. Mycol. 10: 114 (1888).

T: Monte Verde, Cuba, C.Wright, Lich. Cub. 129; lecto: BM, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009); isolecto: US.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale olive to pale yellowish grey, somewhat glossy, smooth, continuous to slightly verruculose, non-rimose. True cortex continuous, slightly yellowish, to c. 40 µm thick, formed by periclinal to irregular hyphae, occasionally not conglutinated in part and forming a protocortex. Algal layer well developed, continuous; calcium oxalate crystals sparse to abundant, mostly large and clustered, a medulla sometimes present. Vegetative propagules not seen. Ascomata inconspicuous, often abundant, to c. 0.4 mm diam., ±rounded, apothecioid, solitary to marginally fused, mostly immersed, rarely somewhat emergent and hemispherical. Disc often becoming partly visible from above, pale flesh-coloured, epruinose to slightly pruinose. Pores to c. 0.2 mm diam., mostly ±rounded, rarely somewhat irregular, entire; proper exciple not visible from above. Thalline rim becoming thick, occasionally funnel-shaped, brighter than the thallus, forming a narrow pale brownish to off-white ring, incurved. Inner ascomatal margin bilayered, with a thin fused proper exciple and a thicker layer of conglutinated paraphyses, not clearly separated from the hymenium, pale yellowish, usually ±amyloid, turning reddish, often with a thick layer of greyish granules towards the epihymenium. Hymenium to c. 70 µm thick, not inspersed, strongly conglutinated; paraphyses somewhat irregular, unbranched, often distinctly septate, slightly interwoven, with slightly to distinctly thickened irregular tips; lateral paraphyses and columellar structures absent. Epihymenium hyaline, occasionally with fine greyish granules. Asci 8-spored; tholus thin or absent. Ascospores 1-septate, rarely non-septate, ellipsoidal to fusiform, with narrowly rounded to subacute ends, hyaline, moderately amyloid, 10–13 × 4–6 µm; locules subglobose to conical; septum thick; ascospore wall thick, non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Rare on bark in montane rainforest in north-eastern Qld; also in the Neotropics.  
  Mangold et al. (2009)  

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

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