Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Phaeosphaeria microscopica

Basionym: Leptosphaeria microscopica P. Karsten, Oefvers. K. Sv. Vet.-Akad. Förh. 2:102. 1872.

Phaeosphaeria microscopica (P. Karsten) O. Eriksson, Ark. Bot. 6: 416. 1976.

 Description: Ascomata depressed globose, 350-480 μm wide, 280-370 μm high, laterally usually covered with hyphae forming sparse prosenchymatous tissue, flatten at tne base, immersed, scattered, with an oblong, ostiolar neck, 100-120 μm long and 70-90 μm wide. Ostiole 30-36 μm wide, lined with polygonal, hyaline to pale brown cells, lacking periphyses. Peridium laterally 30-40 μm thick, composed of an inner layer of pale to dark brown, polygonal cells becoming thicker and darker towards the neck, the base thinner with 6-14 μm thicker cells, which are hyaline, compressed and thin-walled. Asci narrowly clavate, stipitate 80-100 × 12-14 μm, stalk 20-32 μm long, bitunicate, basal, 8-spored. Pseudoparaphyses narrowly cellular, 2-3 μm wide. Ascospores broadly fusiform, 15-19 × 5-6 μm, rounded at the ends, at first hyaline with the first septum forming in the middle, later becoming pale brown to reddish brown and 3-septate, constricted at the septa, second cell enlarged, verrucose, with a mucilaginous sheath surrounding the ascospores.

Taiwan, Hualien County, Central Cross Road 130K from west, 24 Sept. 1994, NCHUPP-2312.

 Habitat: On dead stems of Polygonum multiflorum Thunb. var. hypoleucum (Ohwi) Liu et al.

Canada, Europe, Taiwan.


Hsieh, WH. and Chen, CY. 2000.


W. H. Hsieh

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