to LIAS


Botanische Staatssammlung München © 1995–2008
Data remain intellectual property of the data set authors.



Typhulochaeta couchii (Solheim, Eboh & McHenry) U. Braun

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-04-05); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Typhulochaeta japonica var. couchii Solheim, Eboh & McHenry. Type: Typhulochaeta japonica var. couchii Solheim, Eboh & McHenry.

Taxonomic Literature: Taxonomic notes: +appressoria more or less lobed, evanescent to subpersistent;+ascomata outer wall cells obscure, irregularly shaped, ca. 5-20 µm diam., peridium fairly thin, ca. 8-15 µm wide, yellowish to light brown, semitransparent, revealing asci and ascospores;. Braun U., Beih. Nova Hedwigia 89: 1-700 [554-556] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, endemic). Country or state(s): Arizona (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Quercus arizonica Sarg.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.08)-.12-.16-(.19) mm in diam.. Margin: External filaments present (special apical cells); interwoven with surrounding mycelium (irregular hyphae at the base, these hyphae attach the ascocarps to the mycelium), straight, .35 µm long, 3.5-10 µm in diameter, hyaline, numerous, 5-30 per mm², growing on the upper half of the ascocarp, stiff and straight (sometimes curved or irregular), smooth or rough, thin or moderatly thick (below), not ramified, aseptate.

Asci: 6-15 asci per ascocarp, distinctly stipitate, 65-105 µm long, 35-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (7)-8 per ascus, subglobose, ellipsoid, broadly ellipsoid, or ovoid, 19-36 µm long, 11-26 µm wide; septa absent.

Conidiomata: Absent resp. not observed.

(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.

LIAS Home