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2. Taxonomic part 48
protuberant substrate, concolorous with thallus outside, slightly incurved to erect or recurved.
Exciple fused, thin to evanescent, colorless internally to pale yellowish-brown or (pale)
brownish marginally, apically often covered with fine grayish granules, non-amyloid.
Hymenium up to c. 90 µm high, non-inspersed, strongly conglutinated, paraphyses ±straight,
parallel to slightly interwoven, unbranched, slightly thickened apically, lateral paraphyses
present, inconspicuous, up to c. 20 µm long. Epihymenium moderately thick, hyaline to pale
grayish-brown, with grayish granules and crystals. Asci 8-spored, tholus thin, absent at
maturity. Ascospores (very) small, transversely septate, cell walls (moderately) thin,
±distinctly halonate, hyaline, non-amyloid, rarely oblong to usually fusi- to claviform with
roundish to (sub-)acute ends, loci predominantly angular, end cells hemispherical to conical,
septae thin, regular to irregular, 10-25 x 3-6 µm with 6-9 loci. Pycnidia not seen.
Fig. 4. Chapsa alborosella: growth habit (A), ascomata (B) and ascospores (C, D). A.: Mangold 19
zh; B., D.: FH-isotype; C.: Hale 830729. Bar= A: 1.2 mm; B: 0.8 mm; C: 10 µm; D: 15 µm.
CHEMISTRY – Thallus K-, C-, PD-; no compounds detectable by TLC.
ECOLOGY AND DISTRIBUTION – Chapsa alborosella was collected in Australia on tree bark
in warm-temperate to tropical rainforests at an altitude of ca. 800 m. It is very rare in
Australia, only known from two locations in Queensland and New South Wales. This is the
first report for Australia, thus far it was known from the Neotropics (Hale, 1978, 1981;