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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
Thelocarpon laureri (Flot.) Nyl.

Mém. Soc. Sci. Nat. Cherbourg 3: 191 (1855)

Sphaeropsis laureri Flot., Bot. Zeitung 5: 64 (1847).

T: Griefswald, Austria, J.F.Laurer; holo: n.v.

  Thalline warts numerous, scattered, clustered or densely aggregated, hemispherical, depressed-hemispherical, subglobose or somewhat conical (densely aggregated warts often angular due to mutual pressure), (0.15–) 0.28 (–0.42) mm wide, strongly attenuated at the base, usually pale yellow-pruinose, the pruina forming a uniform ‘dusting’ or minute angular pustules; epruinose warts smaller and pale green. Warts incorporating a thick algal sheath, thinly corticate (cortex to 10 µm thick and hyaline, but usually becoming obscured as the pruina develops), with a 30–100 µm thick thalline layer on either side of the ascoma; pruina 15–30 µm thick. Algae densely aggregated laterally, basally and often subapically in the thalline warts, 6–12 (–14) µm diam. Ascomata solitary, ±completely immersed in the wart, (0.10–) 0.15 (–0.22) mm wide, broadly ovate to depressed-ovate in thin section, usually with only the pale pinkish grey epruinose 0.08–0.15 mm diam. apex visible externally. Ascomatal wall 15–20 µm thick at the sides and base, hyaline, to 30 µm thick at the apex and consisting of thicker-walled cells. Periphyses and paraphyses long and thread-like, moderately to richly branched, occasionally anastomosing, loosely tangled, c. 1 µm thick. Hymenium lax, separating in K, K/I+ pale blue. Asci containing at least several hundred ascospores, elongate-fusiform or narrowly to broadly flask-shaped, uniformly thin-walled (including the apex), 130–190 × 18–30 µm; ascus contents K/I+ pale yellow-brown; ascus wall K/I+ pale blue. Ascospores narrowly to broadly ellipsoidal or subglobose, 1.5–3.5 (–4.5) × 1.5–2.0 (–2.5) µm, occasionally 1- or 2-guttulate.
CHEMISTRY: Pulvinic dilactone (major), pulvinic acid (minor) (J.A.Elix, pers. comm.).
  Known from dolerite stones and boulders, consolidated clay and charred eucalypt bark in southern Tas.; also in Europe, Macaronesia and the U.S.A.  
  McCarthy & Kantvilas (2009c)  

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

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