Caespitotheca forestalis (Mena) S. Takam. & U. Braun [2000196]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-01); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe forestalis (Mena) U. Braun & S. Takam.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula forestalis Mena. Type: Uncinula forestalis Mena.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric or increasing from base to top, followed by 0-4 shorter cells;+ascocarp outer wall cells rounded to irregularly shaped, not polygonal, thick-walled, ca. 8-20 µm diam.; primary mycelium composed of flexuous, sinuous-geniculate, branched, septate, thin-walled, colourless hyphae, penetrating the leaves through the epidermis, hyphal cells 29-82,5 × 2,5-6,25 µm, with coral-like appressoria; secondary mycelium consisting of long, thick-walled, subhyaline to yellowish, smooth hyphae bearing numerous straight, hyaline, aseptate, thin-walled hairs (aerial hyphae), 220-780 × 5 µm, which are subcylindrical or decreasing in diameter from base to top and curved and spiral at the base, apex obtuse. Braun U., Beih. Nova Hedwigia 89: 1-700 [462-464] (1987); Takamatsu S. et al., Mycological Research 109: 903-911 (2005).

Biogeography: Continent: Southern America (Argentina).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Schinopsis balansae Engl.; Schinopsis, Anacardiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.095)-.1-.18-(.19) mm in diam.. Margin: External filaments present (fasciculate, long, filiform, width equal or somewhat decreasing upwards); uncinate (closely to loosely), circinate, or sub-helicoid, up to 10 µm long, 4.5-11 µm in diameter, hyaline or faintly pigmented (below), few or numerous, 10-25 per mm², growing on the upper half of the ascocarp (forming an apical crown), smooth, thin or moderatly thick, not ramified, septate (a few remote septa, inconspicuous).

Asci: 5-10 asci per ascocarp, not stipitate or indistinctly stipitate (shortly stalked), 60-130 µm long, (30)-40-75 µm wide; dehiscence unitunicate (asci large, thin-walled, subhyaline, easily splitting off).

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid, ovoid, or sub-cylindrical, (12.5)-20-35-(37.5) µm long, 12-23 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched (erect, arising from superficial hyphae, solitary, 7,5-12,5 µm wide, somewhat increasing in diameter from base to top, septate, 2-4-celled (45% with two cells; 53% with three cells and 2% with four cells), cytoplasm yellowish, granulate, with large vacuoles in the upper cells, basal septum at the very base or slightly remote, foot-cells cylindrical or somewhat increasing from base to top, followed by a single to four shorter, cylindrical cells); conidiophore cells 37.5-111 µm long, basal cells 25-40 µm long, 6-9 µm wide. Conidium Formation: Conidiogenous cells Polygoni-type (with a single terminal germ tube with coral-like appressoria at the apex), in chains (chains short, conidia gradually maturing, occasionally conidia formed singly). Conidia: Ellipsoid, oblong-obtuse, or nearly cylindrical; macroconidial (fresh conidia with numerous oil drops, thin-walled, vacuolated, cytoplasm granulose, yellowish), not branched, crenate (immature chains with crenulated edge lines), (27.5)-28-45-(62.5) µm long, 12-16-(22.5) µm wide; aseptate; cell wall hyaline; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)