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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 porinaceum Müll.Arg.

Nuovo Giorn. Bot. Ital. 23: 130 (1891)

Myriotrema porinaceum (Müll.Arg.) Hale, Mycotaxon 11: 134 (1980).

T: Awa, Japan, Miyoshi 17; holo: G.

  Thallus superficial on bark or rock, to c. 800 µm thick, pale greyish green to olive, dull to glossy, smooth, rarely somewhat uneven, continuous to usually verruculose or verrucose, ±distinctly rimose. Protocortex discontinuous, to c. 20 µm thick, or the thallus ecorticate. Algal layer usually continuous and well developed; calcium oxalate crystals abundant, large, scattered or clustered. Vegetative propagules not seen. Ascomata inconspicuous, to 1.2 mm diam., ±rounded, solitary, perithecioid, immersed to more often ±distinctly emergent, then predominantly verrucose-hemispherical to subglobose. Disc not visible from above. Pores minute to small, to c. 0.08 mm diam., ±rounded, entire, the apex of the proper exciple becoming visible from above, forming a fused to completely free inner pore margin that is level with the thallus to sunken, off-white to pale brownish, incurved. Thalline rim margin thick, ±rounded, entire, concolorous with the thallus or somewhat paler, level with the thalline rim or ±sunken; thalline rim usually not apparent in immersed ascomata, incurved in emergent ascomata. Proper exciple fused or the upper parts free, hyaline to pale yellowish internally, yellowish grey to yellowish brown marginally, ±amyloid at the base. Hymenium to c. 400 µm thick, either not inspersed (morphotype I) or densely inspersed (morphotype II), moderately conglutinated; paraphyses thin, distinctly bent to curly, especially towards the tips, parallel to slightly interwoven, unbranched, the tips not thickened; lateral paraphyses usually inconspicuous, not conglutinated, to c. 35 µm long; columellar structures absent. Epihymenium hyaline, without granules and crystals. Asci 1 (–2)-spored; tholus indistinct; lateral walls initially thick, thin when mature. Ascospores muriform, predominantly oblong-fusiform, often irregular in outline or bifusiform, straight to slightly bent, the ends mostly narrowly rounded, hyaline, rarely becoming pale yellowish, non-amyloid to faintly amyloid at maturity, 100–230 × 20–45 µm, with numerous locules; locules angular to slightly ±rounded, mostly irregular; transverse septa thin, becoming somewhat indistinct, regular to slightly irregular; ascospore wall thin, non-halonate; endospore thin. Pycnidia not seen..
CHEMISTRY: Thallus K+ orange-red, C–, P–; containing norstictic acid (major), connorstictic acid (minor to trace).
  Usually corticolous, rarely on siliceous rocks, in rainforest and wet-sclerophyll forest in eastern Qld and N.S.W., at altitudes to 1200 m; also in Sri Lanka and Japan.  
  Mangold et al. (2009)  

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

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