428 PLANT DISEASES 



In the American form on R. nigrum the conidia are 

 larger, equal at both ends, 15-25 /«. long. An apparently 

 distinct var. or species. 



Gloeosporium venetmn, Speg., Mich., i. p. 477. — Spots 

 yellowish or ochraceous, small and rounded, or larger 

 and irregular towards the margin of the leaf, and sur- 

 rounded by a dusky purple line ; pustules minute, promi- 

 nent, solitary or gregarious ; conidia elliptico-cylindrical, 

 hyaline, contents granular and guttulate, 7-8 X ^-2-^ f>- 



On living leaves and stems of Rubus chamaeodorus and 

 R. idaeus. 



Distr. — Europe, North America, Australia. 



Gloeosporium ampelophagum, Sacc, Mich., i. p. 217. — 

 Spots or pustules subcircular, often confluent, blackening, 

 drying, and hardening the cortical strata of grape berries, 

 centre of spots greyish or rosy-primrose, due to the presence 

 of the extruded conidia ; pustules originating beneath the 

 epidermis, minute, densely gregarious, stroma thin, pul- 

 vinate, pallid, prosenchymatous, component cells minute, 

 the superficial ones shortly apiculate and bearing the 

 conidia; conidia oblong, ellipsoid or ovate, 5-6X3'5 /*, 

 2-guttulate, hyaline. 



Gloeosporium fructigenum, Berk., Gard. Chron., 1856, p. 

 245. — Pustules concentric, dingy rose- red, erumpent through 

 a simple or laciniate pore, pulvinate ; conidia oblong or 

 cylindrical, often curved, 20-30X5-6 \t., hyaline; basidia 

 subequal in length, simple, rarely furcate, continuous. 



Gloeosporium musarum, Cke. and Mass., Grev., xvi. 

 p. 3. — Pustules innate, erumpent, gregarious, with a rosy 

 tinge ; conidia elongate ellipsoid, ends rounded, continu- 

 ous, hyahne, 10-12X4-5 /*, contents granular. 



