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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
Ocellularia microstoma (Müll.Arg.) Hale

Mycotaxon 11: 134 (1980)

Thelotrema microstomum Müll.Arg., Flora 74: 113 (1891).

T: Mt Tosa, Japan, Miyoshi s.n.; iso: FH-TUCK.

  Thallus endophloeodal to epiphloeodal, to c. 600 µm thick, pale greenish grey to yellowish grey or olive, ±glossy, smooth, continuous to ±verrucose, rimose or not; verrucae near ascomata often eroded, exposing the white medulla. True cortex ±continuous, to c. 30 µm thick, formed by irregular to periclinal hyphae. Algal layer well developed, continuous; calcium oxalate crystals large and clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 1.5 mm diam., ±rounded to irregular, perithecioid to indistinctly apothecioid, solitary to marginally fused, ±emergent, often verrucose, usually depressed-urceolate. Disc not visible from above. Pores formed by the thalline rim margin, to c. 0.1 mm diam., ±rounded, moderately thick, depressed to distinctly annulate, entire or eroded, then the apex of the proper exciple becoming visible as a brownish line; thalline rim incurved. Proper exciple fused, moderately thin to moderately thick above, yellowish brown to brownish internally and in the lower parts, usually dark brown or, rarely, carbonised marginally and distally, distinctly prosoplectenchymatous, occasionally amyloid at the base. Hymenium to c. 500 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent to curly towards the tips, parallel to slightly interwoven, unbranched, with slightly thickened tips; columellar structures absent. Epihymenium hyaline, without granules. Asci 1-spored; tholus absent; lateral walls initially thick, becoming thin. Ascospores muriform, oblong-ellipsoidal to oblong-fusiform, often ±irregular, with ±rounded to subacute ends, hyaline to yellowish or becoming pale greyish brown, strongly amyloid, 150–300 (–330) × 30–60 µm, with numerous locules; locules ±angular, subglobose to irregular; transverse septa thin, distinct and regular; ascospore wall initially thick, non-halonate; endospore initially thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish brown, C–, P+ orange-red; containing protocetraric acid (major), fumarprotocetraric acid (major to trace), conprotocetraric acid (minor to trace), virensic acid (trace).
  A common, corticolous species in rainforest in north-eastern Qld, at altitudes of 100–1100 m; also in East Asia.  
  Mangold et al. (2009)  

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

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