Department of the Environment and Water Resources home page

About us | Contact us | Publications | What's new

Header imagesHeader imagesHeader images

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 microporum (Mont.) Hale

Mycotaxon 11: 134 (1980)

Thelotrema microporum Mont., Ann. Sci. Nat., Bot., sér. 3, 10: 130 (1848); — Coscinedia micropora (Mont.) A.Massal., Atti Reale Ist. Veneto Sci. Lett. Arti, ser. 3, 5: 256 (1860); — Ocellularia micropora (Mont.) Müll.Arg., Flora 74: 112 (1891).

T: Java, [Indonesia], F.W.Junghuhn, Lich. Javan. 143; lecto: PC, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 286 (1981); isolecto: FH-TUCK, US.

  Thallus epiphloeodal, rarely endophloeodal, to c. 800 µm thick, usually pale to medium olive when immature, becoming greyish or greenish grey to yellowish brown, often slightly darker, dull to glossy, smooth, continuous to rugose, becoming distinctly rimose to areolate. True cortex ±continuous, hyaline, to c. 50 µm thick, consisting of periclinal to somewhat irregular hyphae, occasionally the thallus with a thin often discontinuous protocortex. Algal layer well developed, continuous; calcium oxalate crystals absent or sparse, small and scattered, rarely clustered, a distinct medulla often present. Vegetative propagules not seen. Ascomata abundant, to c. 0.25 mm diam., ±rounded, apothecioid, solitary to marginally fused, mostly immersed. Disc usually not visible from above, very rarely becoming partly visible, pale flesh-coloured, epruinose. Pores small, to c. 0.15 mm diam., ±rounded to irregular, usually ±split; proper exciple becoming apically to, rarely, completely visible from above, off-white, usually shrunken, incurved. Thalline rim margin becoming rather broad, ±rounded to somewhat irregular, thin, entire to more often ±split, often ±distinctly raised, whitish or brighter than the thallus, incurved. Proper exciple usually becoming free in upper parts, thin, with or without a thin hyaline to pale yellowish area internally, completely or marginally greyish to pale greyish brown, sometimes faintly amyloid in lower parts. Hymenium to c. 100 µm thick, not inspersed, moderately conglutinated; paraphyses somewhat irregular, ±interwoven, with slightly thickened tips; lateral paraphyses lacking, but the apical exciple occasionally forming similar structures due to radiating hyphae; columellar structures absent. Epihymenium hyaline, occasionally with fine greyish granules. Asci 8-spored; tholus initially thick, thinning or not visible at maturity. Ascospores transversely septate, oblong to ellipsoidal or somewhat fusiform, with ±rounded to subacute ends, hyaline, strongly amyloid, 10–16 (–18) × 5–8 µm, with 3–4 (–5) locules; locules ±rounded, oblong to lentiform, with similar to hemispherical or conical end cells; septa thin, regular; ascospore wall thick, non-halonate; endospore thick. Pycnidia immersed, with an inconspicuous dark pore. Conidia fusiform, to c. 5 × 2 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace), subpsoromic acid (trace).
  Common on bark in rainforest, monsoon forest and wet-sclerophyll forest in northern N.T. and eastern Qld, at altitudes to 1200 m; Palaeotropical.  
  Mangold et al. (2009)  

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

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to Dr P. McCarthy. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.

Top | About us | Advanced search | Contact us | Information services | Publications | Site index | What's new