Hemigrapha (Müll. Arg.) R. Sant. ex D. Hawksw. (1975)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01; 00-02-29; 00-06-07; 00-10-31); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 8. Hemigrapha. Microthyriaceae Sacc. (1883); Dothideales.

Type Information: Type: Hemigrapha asteriscus (Müll. Arg.) R. Sant. ex D. Hawksw.

Taxonomic Literature: Cáceres, M. & Lücking R., Nova Hedwigia 70(1-2): 217-
226 (2000); Diederich P. & Wedin M., Nordic J. Bot. 20: 203-214 (2000); Folan A.C.M. & Mitchell M.E., Proc. Roy. Irish Acad.
70: 163-170 (1970); Hawksworth D.L., Kew Bull. 30: 183-203 [191]
(1975); Hawksworth D.L., Trans. Brit. Mycol. Soc. 74: 363-386 [366]
(1980); Lücking R., Trop. Bryol. 15: 45-76 [60](1998); Matzer
M., Mycol. Pap. 171: 1-202 [104-114] (1996); Müller J., Flora
65: 515-519 (1882) - sub Melanographa asteriscus; Müller J.,
Flora 66: 344-354 (1883) - sub Melanographa tenellula; Santesson R.,
Symb. Bot. Upsal. 12(1): 1-590 [237] (1952).

Biogeography: Checklist records: Australia, Great Britain, Guianas, and New Zealand.

Ecology: Biotroph; lichenicolous; bryophytic, corticolous, or epiphyllous.

Lichen Photobionts: Primary photobiont absent. Secondary photobiont absent.

Thallus: Indistinct.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid (thyriothecioid), irregular or linear (simple or slightly branched), not emerging, becoming adnate to soon sessile. Margin: Prominent; external filaments absent. Exciple: Black or brown. Epithecium: Apical cells brown, hyaline, or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence bitunicate.

Ascospores: 1–2 to c. 8 per ascus, ovoid (ellipsoid-obovoid), 7-24.5 µm long, 2-9.5 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, dark brown, hyaline, or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; sessile.

Conidia: Ellipsoid or bacilliform; microconidial or macroconidial, not branched; aseptate; cell wall hyaline.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)