226 PHYTOPHTHORA PARASITICA. 



Phytophthora Parasitica nov. spec. 



Maculis amphigenis, orbicularibus, centro arescentibus, dilute 

 umbrinus, anulatis, solitariis vel confluentibus ; mycelio intermatricali, 

 ex hyphis inter-et intracellularibus, primo continuis tandem septatis, 

 3-9// crassis, constantibus ; haustoriis sparsis, digitatis vel sub- 

 globosis, raro ramosis, sporangioplioris 100 to 300m longis, sporangis 

 terminalibus, interdum intercalaribus vel lateralibus, plerumque 

 ovoideis, subinde globosis 25-50x20-40//; zoosporis 8-12x5-8//; 

 sporis perdurantibus globosis, flavidis, 20-60//, membrana crassa, 

 levi ; oogoniis et antheridiis in vitro cultis ; oogoniis intercalaribus 

 vel lateralibus, globosis, levibus vel rugosis, melleis, 18-25// (23*8^), 

 pedicellis per antheridia penetrantibus ; oosporis globosis, 15-20*/, 

 ( 18*6m ), membrana crassa, mellea, levi. 



Hab. in foliis seminisque Kicini communis et Sesami indici. 

 Indise orient. 



Note. — While this paper was in the press Sida cordi folia from Dacca and Sesamvw indicvm 

 from Saharanpur were reported to he attacked with Phytophthora. 



In nature the parasite on Sida cordifolia has been found only on the flowers. Healthy 

 flowers, leaves and stems of this host were inoculated with Ph. parasitica. The inoculation 

 proved successful only in the case of flowers. It seems, therefore, not improbable that the 

 species concerned in the Dacca specimens was Ph. parasitica. 



The diseased leaves of Sesamum indicum have characteristic round spots which are 

 either solitary or confluent. On the upper surface they have a brownish centre, surrounded by 

 a whitish pale or dull green area which in turn has a brown areola. On the lower surface the 

 brown centre is surrounded by a more dull green area which has an areola of a pale brown colour. 

 Sporangia borne on long sporangiophores, which resemble those of Ph. parasitica on castor 

 leaves, are found on the upper surface. They are slightly smaller than those found on castor 

 leaves but they agree well in shape. 



