Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Diaporthales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Prostratus cyclobalanopsidis

Prostratus cyclobalanopsidis A. Sivanesan et al., Mycol. Res. 97: 1179-1182. 1993.

 Description: Infection areas up to 18 mm diam., not limited, irregular, included leaf tissue unaffected. Stromata black, hypophyllous, scattered, single to rarely aggregated, subcuticular, erumpent, up to 1 mm or more wide, somewhat dome-shaped, not visible from the lower surface, with rather inconspicuous ostioles. The black, upper stromatic covering is up to 550 μm long and 75 μm thick if over a single ascoma but up to 1 mm long and 125 μm thick when it covers a pair of ascomata, often extending beyond the ascomata at the nonostiolar end where it may sometimes invade the lowere mesophyll cells. The stromatic covering is composed of disoriented epidermal and mesophyll cells with their lumen more or less completely occultated by fungal cells and melanized material. Ascomata uniocular, single or in pairs, horizontal, depressed globose to elliptic, 300-325 μm long, 130-140 μm wide, with an upwardly bending erumpent distinctly, periphysate, ostiolar beak up to 225 μm long and 125 μm wide. The ostiolar beaks in paired ascomata develop on opposite sides and not side by side towards the middle as commonly found in other ascomycetes of similar configulation. The thin ascomatal wall is only 1- to 2-layered and up to 6 μm thick, and is composed of compressed, brown, pseudoparenchymatous cells forming a textura angularis. The black stromata between the ascomata and lower cuticle is up to 250 mm high and 125 μm thick, and composed of palisade tissues occluded by brown to dark brown fungal cells and dark brown melanized material. This lower stromata appear as a black central basal columnar structure below the mid region of the ascomata in vertical sections. Rarely this lower stromatic structure may completely cover the whole region below the ascomata. Paraphyses numerous, hyaline, sparsely branched, septate, up to 5 μm wide, deliquescent. Asci cylindrical, 8-spored, sometimes 4-spored, short stalk, non-fissitunicate, 112-175 × 17-25 μm, with a distinct apical structure not blueing with iodine, sometimes loosening from the subhymenium and freely floating in the centrum. Ascospores ovoid to ellipsoid, uniseriate to partially biseriate in the ascus, smooth, guttulate, 27-32 × 15-19 μm, 1-septate near the basal or apical end, with a large brown cell 27-29 × 15-19 μm and a hyaline apical or basal dwarf cell, 2.5-3 μm long.

Taiwan, Taichung County, 1 Apr. 1991, holotype C. Y. Chen 3 IMI 354625; Taichung County, Kukuan, 18 Jan. 1988, A. Sivanesan 281 IMI 323550.

 Habitat: Parasitic on leaves of Cyclobalanopsis mori.



Sivanesan, A. et al., 1993.


W. H. Hsieh

 Note: null