HYPHOMYCETES 



401 



typically dusky in colour, but in some cases the hyphae are 

 almost hyaline and the conidia dusky ; in other species the 

 hyphae are dark and the conidia pale. 



In some of the members the hyphae are completely buried 

 in the matrix, and conidiophores very rudimentary, as in 



FIG. 133. Fusicladium pirinum, a destructive parasite on pears, i, 

 fungus forming minutely velvety, dark-coloured patches on a pear leaf. 

 The disease usually first appears on the leaves, from which the conidia are 

 washed by rain, etc., on to the young fruit; 2, fungus forming scurfy 

 patches, and causing cracking of the flesh of a pear ; 3, conidiophores 

 bearing conidia. Figs, i and 2, reduced ; fig. 3, mag. 



the genus Torula, where the superficial chains of conidia 

 form blackish-olive stains on dead, herbaceous stems. In 

 other genera, as Dendryphium, Helminthosporium, etc., the 

 conidiophores are well developed, erect, and often more or 

 less branched, bearing the conidia at the tips of the branches. 



2 c 



