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2. Taxonomic part 50
lateral paraphyses inconspicuous, up to 30 µm long, hypothecium conspicuous and thick,
hyaline, strongly gelatinous and slightly amyloid. Epihymenium thin, hyaline, in older
ascomata becoming distinctly brownish, rarely with few grayish granules. Asci 4-6(8)-spored,
tholus thin, not visible at maturity. Ascospores moderately small to moderately large, (sub-
)muriform, cell walls and endospore moderately thick, with thin to moderately thick halo,
hyaline, weakly amyloid, oblong to roundish-fusiform with roundish to narrowed-roundish
ends, loci large, predominantly irregular-roundish to slightly angular, subglobose to often
elongate, transverse septae distinct and thick, ±regular, 30-60 x 10-15 µm with 8-16 x 1-4
loci. Pycnidia not seen.
CHEMISTRY – Thallus K+ yellowish-brown, C-, PD+ orange-red; containing succinprotocetraric
(major), protocetraric and fumarprotocetraric acids (traces).
Fig. 6. Chapsa asteliae: ascomata (A) and ascospores (B, C). A.-C.: BM-isotype. Bar= A: 1.2 mm; B:
20 µm; C: 10 µm.
ECOLOGY AND DISTRIBUTION – Chapsa asteliae
grows on dead leaves of Astelia alpina in (sub-)
alpine heathlands in altitudes ranging from 900 to
1080 m. It is common in Tasmania and was
previously only known from there.
NOTES – This taxon is characterized by a thin,
corticate bright thallus and flattened, subglobose to
urceolate ascomata with (at least in older ascomata)
distinctly layered margins and an often dark disc,
moderately large, hyaline, muriform, amyloid,
thick-walled and halonate ascospores with only a
few longitudinal septae. Further it contains the
protocetraric acid chemosyndrome. Chapsa
lamellifera is similar, for differences see under this
taxon. Chapsa asteliae has similarities to
Topeliopsis, it differs from that genus, however, in
having a thin exciple and thickened paraphyses tips.
SPECIMENS EXAMINED – Australia, Tasmania, Hartz Mnt.
NP., nr. Lady's Tarn, Mayrhofer 9643 (GZU).
Fig. 7. Australian distribution of
C. asteliae.