418 -- 



a 



Fig. 1. 



a) A ripe perithecium (x 110). b) median section through the same (x 110). 



c) An ascus (x 650). d) Ascospores (x 650). 



Among the already described species Testiidina terrestris Biz- 

 zozero approaches nearest to Heleococcum. They are alike in 

 having globiilar perithecia with an areolated surface; the asci, 

 which contain 8 two-locular spores, are in both forms globiilar 

 and lie promisciiously within the perithecium and conidia lack 

 in both species. 



Testiidina differs from Heleococcum in its dark perithecia 

 and spores but its special characteristic is, that the spores are 

 liberated by the disintegration of the peridium into small polygon- 

 ous fragments. It also differs as to the size of the spores and the 

 spores of Testudina have a rugged surface. The most character- 

 istic feature of the genus Heleococcum is the large, smooth, 

 orange-coloured two-celled spores and the light colour of the peri- 

 thecium; the spores are liberated by the disintegration of the 

 peridium. The colour of the perithecium is localized in the wall of 

 the spores, the peridium being quite hyaline. 



