398 



THE FUNGI WHICH CAUSE PLANT DISEASE 



Pk., E. rhododendri Cram., E. japonicum shirai and E. peckii 

 Hal. are reported on Rhododendron and Andromeda; 



E. azalese Pk. and several other species on various Rhododen- 

 drons; E. vitis Prill, was noted in France on the grape; *^ 



E. lauri (Borg) Geyl. is on Laurus. 



E. cinnamomi Petch on cinnamon in Ceylon. 



Agaricales (p. 395) '' '■ "• "■ "* " 



This is a very large order of over eleven thousand species. 

 The mycelium grows to long distances over or through the sup- 

 porting nutrient me- 

 dium, often forming 

 conspicuous long-lived 

 _xii resistant rhizomorphic 

 strands or sheets, some- 

 times developing sclero- 

 tia or again appearing 

 as a mere floccose weft. 

 The basidia bear four 

 simple spores, in rare 

 cases two, six or eight. 

 Other forms of conidia 

 are found in some spe- 

 cies and chlamydospores 

 may be borne either ex- 

 ternally on the sporo- 

 phore, in the hymenium, 

 or inside of the sporo- 

 phore tissue. In the 

 lowest forms the basidia 

 arise directly from the 

 mycelium without the formation of any definite sporophore but 

 in most species the sporophore is highly complex, consisting of 

 large, stalked or sessile, pseudoparenchymatous structures (toad- 

 stools, mushroom, etc.) on special surfaces of which, the hy- 

 menium, Fig. 286, lies; covering gills or spines or linin g pits or 

 pores. 

 The general relation of the basidia to the hymenium and the 



Fig. 285. — ^An agaric (Amanita) sporophore show- 

 ing parts; c, pilous; m, c, striated margin ; g, gills; 

 a, annulus; s, stem; v, volva; mc, mycelium. 

 After Peck. 



