Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Leptosphaeria purpurea

Leptosphaeria purpurea Rehm, Ascomycetes Lojkani lecti in Hungaria, Transylvania et Galicia, p. 54. 1882.

 Description: Ascomata single or in clusters, scattered, immersed, raising the host tissue, visible as black pustules on surface view, or becoming superficial by shedding off host epidermis, subglobose, 150-300 μm wide, 120-250 μm high, rounded at base, apex usually reddish, the host tissue around ascomata appearing reddish as well, wall surface composed of textura angularis. Peridium10-16 μm thick, composed of 2-4 layers of poloygonal, brown and sclerotial cells, cells around ostiole becoming dark brown, with an encrusted outer covering. Asci narrowly clavate, 60-80 × 9-11 μm, 8-spored, nearly sessile. Pseudoparaphyses branched, 2-3 μm wide. Ascospores narrowly fusiform, 20-28 × 4-6 μm, 3-septate, primary septum slightly supra-median, second cell from apex slightly lager, guttulate at each cell, yellowish-brown, smooth, rarely with inconspicuous appendages at ends, overlapping biseriate in upper ascus and uniseriate below.

Taiwan, Yilan County, Shuangliepi, 20 Apr. 2003, NCHUPP-c1032.

 Habitat: On Bidens sp.

Europe, North America, Pakistan, Taiwan.


Chen, CY. and Hsieh, WH. 2003; Shoemaker, RA. 1984.


W. H. Hsieh

 Note: This species can be readily recognized by the reddish staining on the host. The appendages of ascospore, although rarely occurring, are essential to account for the taxonomic relationship with other Leptosphaeria species forming them.