Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Coleroa chaetomium

Basionym: Dothidea chaetomium Kunze:Fr., Syst. Myc. 2: 563. 1823.

Coleroa chaetomium (Kunze:Fr.) Rabenth., Herb. Mycol. No. 1456. 1859.

 Description: Mycelium epiphyllous, occasionally forming hypostroma of one or two layers of palisade-like cells, hyaline to pae brown in colour, not forming leaf spots. Ascomata developing originally from the subcuticular mycelium or hypostroma, erumpent and then becoming superficial, subglobose, 126-180 μm in diam., connate with a flattened base, ostiolate at the rounded apex, scattered to aggregated in small groups, often confluent, setose over the upper half, setae few to numerous, continuous or with few septa, dark brown, erect, stiff, up to 60 μm long, swollen at the base, slightly attenuate upwards. Peridium 1-14 μm thick around the upper and lateral sides, composed of 3-4 layerd, dark brown, polygonal, laterally compressed cells, the basal portion 20-32 μm thick, applante, composed of many layers of hyaline to light brown, polygonal cells, peridial wall of cells of textura angularis, up to 16 μm wide. Asci bitunicate, basal, saccate to oblong, 37-57 × 11 14 μm, sessile, apex rounded and thick-walled; pseudoparaphyses sparse, deliquescent. Ascospores biseriate, broadly clavate, 11-16 × 5-6 μm, widest at the upper third, septate below the middle, yellowish to olivaceous brown, smooth or minutely verruculose.

Taiwan, Nantou County, Meifeng, 23 May, 1995, NCHUPP-2336.

 Habitat: On living leaves of Rubus incanus Liu and Yang.

Asia, Europe, North America.


Barr, ME. 1968; Chen, CY. and Hsieh, WH. 1996.


W. H. Hsieh

 Note: Another specimen collected from Meifeng, Nantou Hsien (NCHUPP-2382) on the same host had hemispherical to flattened globose ascomata which were mostly gregarious, often confluent forming circular spots limited by the underlying subcuticular hypostroma. It is apparent that this Meifeng collection is a stromatic form of this species (Barr, 1968).