392 



THE FUNGI WHICH CAUSE PLANT DISEASE 



Uredo Persoon (p. 389) 

 Spores produced singly on the terminal ends of mycelial hyphse. 

 Germination by a germ-tube which does not produce basidio- 

 spores, but enters the host-plant through 

 the stomata. 



These forms are in the main discussed 

 under their telial genera. 



U. orchidis Wint. and U. satjrrii Mass. 



are in the leaves of cultivated orchids. 



U. tropaeoli Desm. is found onTropaeolum; 



U. arachidis Lag. the peanut; ^''^ U. auran- 



Q KJ tiaca Mont, on Oncidium.^ U. au- 



N( U tumnalis Diet, on Chrysanthemums in 



* Japan ^^ and U. kuhnii (Kr.) Nak. on 



sugar cane in Java. 



The Auriculariales (p. 323) 



Mycelium septate, forming a gelatinous, 

 irregular and expanded or capitate sporo- 

 carp; hjrmenium variable, densely beset 

 Fig. 2S2.— Various basidia of with basidia, on each segment of which is 

 i^'auriSriM-'fTiS^M borne a long sterigma, with its single 



witii longitudinal divisions; spore. 



3, daciyomycetes with un- ~i. » • i • i xi 



divided forked basidium. ihe Aiuriculanales are mostly sapro- 

 phytic and of little economic importance. 

 They embrace some fifty species in two families and are chiefly 

 of interest on account of the form of their basidia Fig. 282, which 

 shows relationship both to the Ustilaginales and to the orders to 

 follow. 



Ket to Families of Auriculariales 



Hymenium gymnocarpous 1. Auriculariaces, p. 392. 



Hymenium angiocarpous 2. Pilacracese. 



Auriculariacese 



Key to Tribes or Gexesa of Auriculariacese 

 Sporocarp arising from a ton-like base of 



mycelial threads I. Stypinelles. 



