Camsk — B mirn Hof of Citrus. 
83 
but consider that the merging' of Pi/thiaci/stis Avith Pliytophtltora is' 
at ])resenfe inadvisable owing to tlie douljtful delimitation of tliese 
genera and of Pi/thium. 
P. ritrophthora (29) is defiiUMl as having ovate or lemon-shaped 
sporangia 20 x 80 to 60 x OOmmm. averaging 80 x dOmmm. and. ])i' 0 - 
duciiig 5 — 40 zoos])ores. Tlie zoos})or(‘s are 10 — lOmmni. in diameter 
Avitli lateral cilia 80 to 40mmm. in length. No sexual bodies have evoi- 
b(‘en develo])ed in cultures of tv])ical citrofih fkora according ic- 
Rmith & 8 mitli (81 ) . Tliey also state tliat tho mycelium on affected 
fruit is always sterile (29 & 80) . 
("ultiires of I\ cifroplitltora, Sm. & Sm, and Putlioplifliora tcrrc'^. 
fris, Sheri), were obtained from (California in 1914 through the 
courtesy of Professor Fawc<‘tt . Tlie latter fungus is the cause of 
mal-di-gomina or foot rot of citrus in (’alifornia. Florida, etc., 
(l."> & lo) . Orang'es were infected with these culturt'S and Avith 
J\ hU)cnutlis, and the resultant Brown Kots w(*re idimtical in aj)]>ear- 
ance. Both organisms Avere grown in parallel siudes of culture 
media Avith P. hif)rrnaJis. In no case Avere oos[)ores ])roduced on 
P. citrojihthora though couidia Avere produced in fair numbers on 
])()tato rlextrose agar, oat extract agar and glucose ])e])tone agar, 
es])ecia]ly on cultures over four Aveeks old. They Avere ])roduced 
more readily by placing jiortions of agai’ cultures in Avat(>r. Measure- 
ments of 100 couidia ]u-oduced in Avater from a culture on ])otato' 
dextivose agar averaged 80 x 88 .ommm. Avitli a range of 19 — 87 x 19 
— 60mmm. In shape they varie<l from globose to flask-shaped or ovoel. 
The attachment of the s])oro])hoi( Avas A'ery frequently, even nor- 
mally, ecce ntric :in<l at times epiite lateral (IMate V.). This character 
is illustrate<l by both Smith (80) and Doidge (12). Therc^ Avas also 
not infr(‘qiiently a i-ellulose projection into the conidium at the point 
of attachment of the s])orophore . This also is shoAvn bv Smith (80) . 
Neither of these'- tAvo features are found in P .liilfenialis. 
P. icrrr.stris, Rherb., is readily distinguished from P. hihcniaUs- 
by its more globose spores, and smaller oospores and the jiresence of 
clilaniydosj)ores. As alrea<ly stated this sj)ecies is considered to lx- 
synonymous with P. parasitica^ T)a«t. The culture used agreed verv 
closely Avith Rherbakoff ’s description. 
It is interesting to note that the three cultures AA'ere found to b. 
readily distinguishable macroscopieally on potato dextrose agar - 
that determination could be made long before the conidia AA'ere de- 
veloped (Plate II.). 
The folloAving notes Avere prepared from six series of plate cul- 
tures, and three on slopes made at different times. 
