Heterocarpon Müll. Arg. (1885)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Heterocarpon. Verrucariaceae Zenker (1827); Verrucariales.

Type Information: Type: Heterocarpon ochroleucum (Tuck.) Müll. Arg.

Taxonomic Literature: Eriksson O.E. & Hawksworth D.L., Syst. Ascomycetum 10: 27-67 [38-39] (1991); Harada H., Syst. Ascomycetum 10: 1-6 (1991); Müller J., Flora 68: 503-518 (1885).

Biogeography: Checklist records: Sonoran Desert and United States and Canada (continental).

Ecology: Biotroph; lichenicolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont absent. Secondary photobiont absent.

Thallus: Indistinct.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, not emerging. Wall: Not carbonized, not fused. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Present. Interascal Hyphae: Absent. Hypothecium: Brown.

Asci: Tholus thickened, not amyloid; dehiscence bitunicate or verrucarial; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 17-23 µm long, 5 µm wide, aciculate; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Present or absent resp. not observed; pycnidial; immersed.

Conidiogeneous Cells: Apical. Conidia: Bacilliform.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)