THE FUNGI WHICH CAUSE PLANT DISEASE 215 



Loculisti-oma Patterson & Charles ^'"^ (p. 199) 



Stromata upright, sessile, at the nodes of the host, fleshy, soft, 

 green or black, containing conidial chambers in which are pro- 

 duced hyahne filiform conidia and on the outer surface of which 

 are borne Cladosporium-Uke conidia; perithecia scattered, partly 

 immersed, ostiolate; asci clavate, cyhndric, 8-spored; spores fusi- 

 form, 3 to many-septate, olivaceous, biseptate; paraphyses none. 

 There is only one species known. 



L, bambusae. P. & C.^^^ 



Stromata 1 cm. long by 2 mm. in diameter; perithecia almost 

 spherical, 125 x 100 n; asci 45-50 x 9-10 fi; spores 22 x 4. 5-5 fi; 

 primary conidia 14-16 x 0.75-1 n; borne in chambers on basidia, 

 8 X 0.5 ju; secondary conidia external, 1 to 3-ceIled, borne on 

 external olivaceous hyphse. 



It causes a witches' broom of bamboo (Phyllostachys sp.), in 

 China. Infection probably occurs in the terminal node. The 

 fully developed sclerotia-like structures, resembling those of 

 Claviceps, are dark green to black when mature, and consist of 

 a central hyaline sclerotial tissue in which are many round 

 conidial chambers. Perithecia develop from the peripheral 

 layer. 



Dothidiales (p. 124) 



There is only one family the Dothidiaceae. 



Mycelium developed in the substratum, septate, at length form- 

 ing a thick, dense, very dark stroma in which the perithecia are 

 sunken and with which their walls are completely fused, rarely 

 partly free; asci borne from the base of the perithecium; paraphyses 

 present or none. 



The Dothidiaceae contain some four hundred species and more 

 than twenty-four genera. They differ from the last order in their 

 firm black sclerotium-like stromata which are usually pale to white 

 within. The perithecia are usually grouped together in great num- 

 bers in the external layer of the stroma, sunken in its undiffer- 

 entiated body. Conidia of various forms are present. 



