272 PttYTOPHtHOEA MEADtl 11. Sp. ON HEVEA BRASlLIENSlS 



FrcncU-bean-agar, in wl)ich are numerous resting conidia. I Lave searched 

 my cultures of various dates but have found no resting conidia in tbem, and 

 during the three years the fungus has been under observation in culture in 

 Coimbatore, it has not produced resting conidia, and they have not been found 

 in nature in South India. It may be that climatic differences account for 

 the difterence of behaviour of the fungus in Coimbatore and Pusa, for in the 

 former place the annual range of temperature is from about GO" to 10 fF.; 

 while in the latter it is from about 32° to H2°F. 



While studying Pythium palmivorum Butl., the fungus that causes bud-rot 

 of palmyra palms, Borassus Jiahelliformis, in the Godavari andKistna districts, 

 Butler^ found that resting conidia could not always be found, but that some- 

 times they could be and then were present in very large numbers. They were 

 either absent or rare at certain seasons and in some years. The same expe- 

 rience has been found with this fungus on coco-palms, Coros nucifera, in South 

 India. Resting conidia are seldom seen, but early this year they Ave re found 

 in very large numbers indeed on large discoloured areas on young expanding 

 leaves. It appears that a similar experience is presented by P. Meadii in 

 culture in South India and Pusa. 



The fact that P. Meadii can produce resting conidia rather confirms the 

 identity of the Phytophthoras from Burma and from South India. I have 

 made measurements of the resting conidia from the culture of the Burma 

 Phytophlhora and from that of the South Indian Phytophthora returned to 

 me by Dastur, and the measurements come very close together. My measure- 

 ments of the former, however, are larger than those given by Dastur in his 

 paper. The measurements of 100 resting conidia of the Burma Phytophthora 

 in French-bean-agar measured in Coimbatore were 18 — 47 X 18 — 46/i, the 

 average being 34"3 x 33'8ft while those in Dastur's paper are 17 — 34/a. The 

 measurements of 100 resting conidia of P. Meadii from a sub-culture in French- 

 bean-agar returned from Pusa were 16—47 X 16 — 47/^, the average being 

 34-8 — Mil. 



These resting conidia also come fairly close to those of P. Faberi in size. 

 Rorer gives the variation as 30 — 50/a. My measurements were on cacao fruits 

 26 — 46 X 23 — 43/A, the average being 35*3 X 35/x, on French-bean-agar 

 24 — 51 X 22 — 49/x, the average being 38 x 37/a, and on inoculated Hevea fruits 

 20— 39X18— 39/x, the average being 34-5x34/^. 



1 Butk-r, E. J. •' The Bud-i-jt of Palmyra Paliu.s.'" Mam. iJept. A'jric, India, But. Series, 

 111, pp. 255—257. lUlO. 



