CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 73 



author for investigation. A species of Ceratostomella was 

 found among the cells of the wood and fruiting quite 

 abundantly on the surface. The characters of the fungus 

 aoree in part with O. pilifera, to which it is closely related. 

 It has ascospores which are constantly of a slightly differ- 

 ent shape, and is often characterized by more than one 

 whorl of bristles on the beaked ostiolum. The conidia are 

 considerably smaller, and the hyphae on which they are 

 borne are more frequently branched, thus giving rise to 

 larger clusters. Owing to the frequent presence of more 

 than one ring of bristles on the ostiolum, the name C '. 

 pluriannulata is here given to the species, with the fol- 

 lowing cultural characters : — 



Mycelium. 



The growth of the mycelium from either conidia or 

 ascospores resembles that of C. pilifera. The spores 

 germinate in pine-decoction agar in 2 to 3 hours, and in 2 to 

 3 days a white, floccose mycelium bearing conidia appears. 

 In from 5 to 10 days perithecia appear, the development 

 of which is like that of C . pilifera. 



Conidia. 



The hyaline unicellular conidia are borne on branching 

 septate, hyaline, upright hyphae in simple or compound 

 whorls (pi. 5, f. 1). In the older portions of the colony, 

 the conidia fail off and adhere in masses forming clusters 

 resembling Ceplialosporium. These clusters vary in size 

 from 10ft to 100ft in diameter. The larger clusters are 

 formed by the adherence of several spore clusters into one 

 mass. The conidia measure 5ft to 8ft in length and 2ft to 

 3ft in width, averaging 6ft by 1.5ft. 



Perithecia. 



The perithecia are borne superficially on the wood, or on 

 the mycelium, there being no definite stroma in this or in 



