Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Guignardia castanopsis

Guignardia castanopsis W. H. Hsieh et al., Mycol. Res.101: 101-102. 1997.

 Description: Leaf spots amphigenous, brown, irregular in shape, initiating from the margin and then diffusing toward the inner up to half the dimension of the leaf, with a dark brown margin. Ascomata 185-215 μm wide, 180-254 μm high, epigenous, immersed, scattered, subglobose, erect to oblique, shortly papillate. At first the papillate portion consists of intact pseudoparenchymatous cells, i.e. without a preformed ostiole, which are identical to the peridial cells, then becoming schizogenous and gelatinized from the upper part downwards to the locule and forming a canal which is lined with periphyses-like cells 4 μm in diam. Peridium 25-31 μm thick, composed of 4-6 layers of dark brown, angular to slightly compressed cells up to 10 μm in diam., occasionally the innermost cells lining the minute pores in the malanized cell walls. Asci 40-54 × 12-15 μm, bitunicate, oblong to broadly clavate, sessile to shortly stipitate, stipe up to 13 μm long, loosening in the locule. Ascospores 8-11 × 4-5 μm, broadly oblong, aseptate, rounded at ends, hyaline, uniseriate to biseriate inside the ascus.

Taiwan, Taoyuan County, Lalashan, 20 Oct. 1994, holotype IMI 369598 and isotype NCHUPP-2317.

 Habitat: On living leaves of Castanopsis sp.



Babb, M. 1987; Chen. CC. 1967.


W. H. Hsieh

 Note: Phyllosticta conidia 9.0-10.5 × 4.0 μm, hyaline, aseptate, obovoid to ellipsoid with mucilaginous sheath and apical appendage. Only a few conidia of Phyllosticta were found on Castnopsis sp. collected from the type area and the measurements of the conidia agreed with the descriptions given by Chen (1967) for P. castanopsis.