Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Dictyocyclus hydrangeae

Dictyocyclus hydrangeae Sivan., et al., Bot. J. Linn. Soc. 126: 323-326. 1998.

 Description: Superficial mycelia absent. Ascostromata 290-350 μm wide, 88-112 μm high, discoid, black, scattered, hypophyllous, multilocular, opening by irregular fissures; locule 100-144 μm wide and 36-48 μm high arranged around a raised, sterile, central column of stroma 95-110 μm wide and 60-90 μm high penetratingt the host epidermis and distinctly discolouring the host cells below the epidermis to a brownish tinge. Peridium a single layer composed of more or less thick-walled brown cells, 5-7 μm long and 3-5 μm wide, radiating from the centre of a sterile, dark column. Asci 30-32 × 22-28 μm, obovoid, thick-walled, sessile, bitunicate, 8-spored interspersed amongst remanants of paraphysoidal elements. Ascospores 14-20 × 6-10.5 μm, obovoid, hyaline, thin-walled, dictyoseptate with 3-5- mostly 5-transverse septa and one longitudinal or oblique septum in some of the central cells but rarely in the end cells, sometimes enveloped in a mucilaginous sheath.

Taiwan, Taitung County, 25 March, 1995, holotype IMI(371179).

 Habitat: Parasitic on leaves of Hydrangea intergrifolia Hayata.



Raciborski, M. 1900; Sivanesan, A and Sinha, ARP. 1989.


W. H. Hsieh

 Note: Adonata is the only genus in the Parmulariaceae with dictyoseptate ascospores. Dictyocyclus differs from it by the multiloculate ascostromata opening by irregular fissures and its obovoid ascospores.