THE FUNGI WHICH CAUSE PLANT DISEASE 405 



H. these Bern, occurs on tea; ^ H. filamentosus Pat. on live 

 leaves of Caryophyllaceae and Amaryllidaceae in Quito; H. fu- 

 ciformis (Berk.) McAlp on grasses in Australia. 



An undetermined species of Hypochnus was studied by Eustace^^ 

 as the cause of rot of stored apples. Artificial inoculations proved 

 its parasitism, though it was unable to make entrance through 

 sound surfaces. 



The spores are hyalme, smooth, usually obovate, 4-5.5 x 2.5-3.5 ju. 



Aureobasidium Viala & Boyer ^^ (p. 403) 



The fungus body consists of delicate, floccose, more or less 

 webby masses of much-branched, septate, golden hyphse; basidia 

 with numerous sterigmata; spores cylindric. 



A single species, A. vitis, V. & B., occurs on grape roots in 

 France and Italy*'" '''* 



Thelephoracese (p. 402) 



Sporocarp leathery or membranous, (rarely fleshy, corky or 

 punky) resupinate or pileate, simple or compound; hymenophore 

 smooth, warty or wrinkled; basidia numerous, interspersed with 

 spine-like cystidia. 



This is a very large family, but of its eleven hundred species 

 only a few are parasites. 



Key to Genera op Thelephoracee 



Hymenophore without cystidia 

 Hsonenophore entirely resupinate 

 Spore membrane colorless 

 Contents colorless 

 Spores sessile 

 Basidia with 2 sterigmata ... 1. Cerocorticium. 



Basidia with 4 sterigmata 2. Corticium, p. 406. 



Basidia without sterigmata. . 3. Protocoronospora,p.409. 



Spores stalked 4. Michenera. 



Contents colored 5. Aleurodiscus. 



Spore membrane colored 

 Hymenophore soon gelatinous .... 6. Aldridgea. 



Hymenophore fleshy-leathery 7. Coniophora. 



Hymenophore partially free, shelving 



Context of several layers 8. Stereum, p. 409. 



