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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 glaucophaenum (Kremp.) Hale

Mycotaxon 11: 133 (1980)

Thelotrema glaucophaenum Kremp., Nuovo Giorn. Bot. Ital. 7: 19 (1875); — Ocellularia glaucophaena (Kremp.) Zahlbr., Cat. Lich. Univ. 2: 591 (1923).

T: Borneo, [Malaysia], 1866, O.Beccari 92; holo: M; iso: G n.v.

Ocellularia costaricensis Müll.Arg., Bull. Soc. Roy. Bot. Belgique 30: 75 (1891); Rhabdodiscus costaricensis (Müll.Arg.) Vain., Ann. Acad. Sci. Fenn., ser. A 15(6): 184 (1921); Ocellularia alba f. costaricensis (Müll.Arg.) Redinger, Ark. Bot. 28A(8): 18 (1936); Myriotrema costaricense (Müll.Arg.) Hale, Mycotaxon 11: 133 (1980). T: Baie de Salinas, Costa Rica, 1892, H.Pittier, Pl. Costaric. Exs. No. 5320; holo: G; iso: M.

Thelotrema emergens Vain., Ann. Acad. Sci. Fenn., ser. A, 15(6): 192 (1921); Ocellularia emergens (Vain.) Zahlbr., Cat. Lich. Univ. 2: 590 (1923). T: Butuan, Mindanao, Philippines, C.M.Weber 1416; holo: TUR-V 26885; iso: NY.

Myriotrema subcostaricense Sipman, Acta Bot. Fenn. 150: 168 (1994). T: Upper Mazaruni District, Guyana, H.J.M.Sipman 19424 & A.Aptroot; holo: B.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale yellowish green to olive-green, ±glossy, smooth, continuous to rugose to verrucose, occasionally sparingly rimose. True cortex ±continuous, to c. 25 µm thick, consisting of periclinal hyphae. Algal layer poorly to well developed, ±continuous; calcium oxalate crystals sparse to abundant, large and clustered; medulla usually distinct. Vegetative propagules not seen. Ascomata often conspicuous, to c. 0.8 mm diam., often larger when fused, ±rounded to irregular, apothecioid to somewhat chroodiscoid, solitary to more often fused, becoming slightly to distinctly emergent, mostly irregularly or regularly urceolate. Disc usually partly visible from above, rarely completely exposed, pale flesh-coloured, whitish-pruinose. Pores broad to gaping, to c. 0.6 mm wide, ±rounded to irregular, entire to slightly ragged; proper exciple often becoming apically visible, rarely completely visible from above, ±free, whitish, occasionally slightly shrunken, incurved to erect, rarely slightly recurved. Thalline rim margin broad to gaping, ±rounded, more commonly irregular, thick, entire, but usually split to lacerate or eroded, concolorous to whitish (due to the exposed medulla) and somewhat pruinose; thalline rim usually becoming erect to slightly recurved. Proper exciple fused to partly or entirely free, thick, hyaline internally, pale brownish or greyish marginally, occasionally including substratum material, non-amyloid. Hymenium to c. 100 µm thick, not inspersed, strongly conglutinated; paraphyses thick, irregular and often distoseptate, ±interwoven, with thickened irregular tips; lateral paraphyses and true columella absent; columella-like structures often present among fused ascomata. Epihymenium hyaline, with coarse greyish granules and fine crystals. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, occasionally with a single longitudinal septum, ±ellipsoidal to oblong, with narrowly rounded to subacute ends, hyaline, variably amyloid, but usually distinctly amyloid at maturity, 10–18 (–20) × 5–8 µm, with 2–6 (–8) × 1 (–2) locules; locules ±rounded, subglobose to lentiform or oblong; end cells hemispherical to conical; septa thin to thick, often irregular; ascospore wall thin to thick, thinly halonate; endospore thick. Pycnidia not seen; according to Frisch et al. (2006) immersed in thalline warts with a brownish pore; conidia fusiform, to 6 × 1.5 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace), subpsoromic acid (trace).
  A common, corticolous species in lowland to montane rainforest in eastern Qld; pantropical.  
  Mangold et al. (2009)  

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

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