340 THE FUNGI WHICH CAUSE PLANT DISEASE 



across, soon naked, orange-red fading to white, ruptured epidermis 

 evident; spores ellipsoid, 18-23 by 20-30 fi; wall thin, 1-1.5 fi, 

 densely verrucose, with prominent, elongate papillae. 



III. Telia hypophyllous, scattered, often confluent, small, 0.2- 

 0.5 mm. across, slightly elevated, blood-red, fading to pale brownish- 

 yellow; spores with wall swelling 15-25 fi thick above; contents 

 orange-red fading to nearly colorless, cylindrical or clavate-oblong, 

 17-24 by 55-85 m, roimded or obtuse at each end. 



and I on Pinus rigida. 



II and III on Campanula and kin. 



There are numerous other species of less importance. 



Melampsoraces (p. 335) 



Telia forming a more or less definite crust or colunm; teliospores 

 compacted laterally into layers or rarely solitary in the tissues, 

 sessile; wall firm or rarely with a gelatinous layer. 



The family is of httle importance. Its uredinial and telial stages 

 do slight injury on poplars and willows. 



Key to Genera of Melampsoraces. 



Telia indehiscent. 

 Son all subcuticular; teliospores com- 

 pacted in dense layers to form a crust ; 

 SBcia when present without a perid- 

 ium; uredinia when present without 

 a peridium or with an imperfect 

 one of paraphyses 

 Teliospores in a single layer; uredinia 

 with spores and paraphyses inter- 

 mixed 1. Melampsora, p. 342. 



Teliospores in more than one layer 

 Uredinia with peripheral paraphyses 



only 2. Physopella, p. 345. 



Uredinia without paraphyses 3. Bubakia. 



Pycnia subcuticular, other sori subepi- 

 dermal, or the telia within the epider- 

 mal cells or between the mesophyll 

 cells; uredinia when present with a 

 peridium 



