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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 suecicum (H.Magn.) P.James

Lichenologist 9: 186 (1977)

Ocellularia suecica H.Magn., Bot. Not. 1937: 125 (1937).

T: Bohuslän, Sweden, 22 June 1936, H.Magnusson s.n. (Lich. Sel. Scand. Exs. 230); lecto: BM, fide P.W.James, Lichenologist 9: 186 (1977); isolecto: C, F.

Ocellularia bonplandiae var. obliterata Müll.Arg., Bull. Herb. Boissier 1: 54 (1893). T: Warburton, Vic., F.R.M.Wilson 513; holo: G; iso: NSW.

  Thallus endophloeodal to epiphloeodal, to c. 150 µm thick, pale yellowish grey to pale greyish green or olive, dull to slightly glossy, smooth, continuous to ±distinctly verruculose, sparingly rimose or not. Protocortex discontinuous, to c. 20 µm thick, occasionally becoming conglutinated and forming a thin true cortex of periclinal hyphae. Algal layer usually ±well developed and continuous, often becoming discontinuous due to calcium oxalate crystal inclusions; calcium oxalate crystals abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 0.7 mm diam., ±rounded, apothecioid, sessile, solitary, occasionally marginally fused, rarely immersed, usually emergent, hemispherical, rarely urceolate or subglobose. Disc often becoming partly visible from above, greyish, pruinose. Pores small, rarely gaping, to c. 0.4 mm diam., ±rounded to irregular, entire to split, the apex or, occasionally, the complete proper exciple visible from above, often shrunken, apically pale, pale brownish towards the base, incurved, rarely somewhat erect. Thalline rim margin thin to thick, entire to split or somewhat eroded, ±rounded, usually becoming wide to gaping, incurved to slightly erect, concolorous with the thallus or yellowish to pale orange. Proper exciple free, thin, hyaline to pale yellowish internally, yellowish to brownish marginally, apically covered by greyish granules, occasionally slightly amyloid at the base. Hymenium to c. 130 µm thick, not inspersed, weakly conglutinated; paraphyses parallel to slightly interwoven, unbranched, the tips thickened; lateral paraphyses usually inconspicuous, to c. 25 µm long; columellar structures absent. Epihymenium hyaline, with greyish granules and, occasionally, small crystals. Asci 8-spored; tholus thick, thin at maturity. Ascospores transversely septate, ellipsoidal to broadly fusiform, rarely broadly clavate, the ends narrowly rounded to subacute, hyaline, non-amyloid to faintly amyloid, 20–40 (–60) × 8–15 µm, with 6–12 (–14) locules; locules ±rounded to angular, subglobose to cuboid or irregular; end cells hemispherical to conical; septa thick, ±irregular; ascospore wall initially rather thick, becoming even thicker, with a thin to thick halo. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
   A common, corticolous species in eastern Qld, N.S.W., Vic. and Tas.; occurs in rainforest and wet-sclerophyll forest at altitudes to 1400 m. Subcosmopolitan.  
  Mangold et al. (2009)  

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

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