261 
species and some growth differences as wel] as its inability to 
infect cacao pods, distinguish it from P. faberi. It would seem 
to the author no more justifiable to include it in one species 
with P. faberi than to unite it with P. meadii 
P. palmivora might prove to be a useful species for growing 
in mixed cultures with other forms which develop oospores in 
pure cultures either scantily or not at all. P. nicotianae, Br. de 
Haan appears to be such a species concerning the oospores ae 
relationship of which nothing very definite is known altho 
it is a destructive parasite on tobacco in some parts of the tose 
Table showing Cultures in which Oospores were present or absent 
and their Mean Size and Variation. 
Oospores. Oogonial wall. 
Culture. HF 
umber Mean pubes ean ie 
measured. | diameter. Variation. diameter. Variation. 
l. Pure cacao. p. - none — — — — 
2. —— ensue: p- none — — — — 
o. 2 
3. aut p none a = pits a 
no. 3 
4. Pure cotton boll none — --- se = 
5. Mixed coconut none —— ap a Pe 
p.2+3 
6. Mixed coconut none — cra Ee a2 
2+ cotton boll 
Fe ed coconut none at — — _ 
3 and tton 
boll 
8. Mixed cacao + 46 23-3 19-26-5 ‘29-0 25-32-5 
coconut 3 
Mixed cacao + 52 23-1 17-8-27°8 28-6 22-35 
coconut 3 
10. Mixed cacao -+- 30 23-1 19—28-6 28-9 21-8- 35-5 
coconut 2 
11. Mixed cacao + 84 23-5 17-8-28-6 29-0 22-35 
cotton boll 
12. Mixed cacao + 22 23-6 20-25-3 28-8 25-33 
** ‘parasitica ”’ 
(castor) 
13. Pure “ parasit- — 18-6 15-6—20°4 22-6 — 
ica ’’ (castor) 
14, sae coconut 30 19-2 16-21-5 23-5 20-26 
3 ** nara- 
sitica *’ (coco- 
nut ) joe 
15. Pure ‘ parasit- — 19-3 ee abl atte 
ica ” (coconut 
16. Mix ‘as oO 43 22-0 17-8—-27-3 _— = 
coconut 3 (co- 
conut 3 inocu- 
lated 2 da 
before cacao) 
All measurements in terms of #. 
