Muellerella pygmaea var. athallina (Müll. Arg.) Triebel
Data Set Maintenance: Data set compiled (by C. Kainz, 03-01-29).
Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Muellerella. Synonyms: see Triebel D. (1989) Bibl. Lichol. 35: 1-278; Verrucariaceae Zenker (1827); Verrucariales.
Type Information: Basionym: Tichothecium pygmaeum Körb. (1853).
Taxonomic Literature: Taxonomic notes: +ascomatal wall upper part often thickened, brown to black, lower part brown or red brown;. Triebel D. (1989) Bibl. Lichol. 35: 1-278; Matzer M. (1993) Nova Hedwigia 56: 203-210; Triebel et al. (1991) Mycotaxon 42: 263-296.
Biogeography: Holarctic (worldwide in extratropical regions). Checklist records: Sonoran Desert and United States and Canada (continental) (the species is relatively common throughout Arizona and southern California).
Ecology: Biotroph; lichenicolous; endosubstratic.
Ascocarps: Perithecioid, not emerging, soon sessile, (.1)-.125-.2-(.25) mm in diam.. Periphyses: Present (periphyses, c. (1-)2-3 µm diam., up to 40 µm long).
Ascospores: 12-16 (32-64-spored) per ascus, ellipsoid or oval, 6-8.5 µm long, 3-4.5 µm wide; septa present; transversally septate; 1-transversally septate; wall thin, dark brown or pale brown, not ornamented.
Conidiomata: Present; pycnidial (c. 45-90(-100) µm diam., immersed).
Conidia: (2.5)-3-5-(5.5) µm long; (.5)-1-1.5-(2) µm wide.
(report generated 04.Okt.2007)
In case that additional characters and states are required to be included in this data set, consult the LIAS Instructions to Participants and follow the procedures described there.