BULLETIN OF THE BUSSEY INSTITUTION. 229 
REMARKS ON THE PRECEDING LIST. 
CHYTRIDINES. — But little attention has as yet been paid to the 
American species of this order. The members of the order are uni- 
cellular parasites inhabiting the cells of both aquatic and land plants, 
and they are probably widely diffused. Of the marine species, Chy- 
tridium Plumule, Cohn, is common on Callithamnion cruciatum, Ag., 
and we have also observed it on Callithamnion heteromorphum, Ag., 
received from California. It has not yet been observed on Callitham- 
nion plumula, Ag., in America, but it must be borne in mind that 
that species is comparatively rare in this country. The Lectocarpi, 
especially those which grow upon dirty wharves, are beset by species 
of this order, which have not, as yet, been studied on our coast. 
Looking at the species of Synchitrium, which form spots upon various 
land plants, we find Synchitriwm Anemones very common, growing in 
company with Urocystis pompholygodes and Peronospora pygmea on 
Anemone nemorosa. It is not unusual to find plants whose stems are 
swollen and blackened by the Urocystis, and whose leaves are frosted 
with the Peronospora, while scattered all over the plant are the minute 
purple dots of the Synchitrium. A second species of Synchitrium is 
not uncommon on leaves and stalks of Potentilla Canadensis, over 
which it is scattered in the shape of purple globules. The species 
differs in no respect from that mentioned by Schreeter, in Cohn’s 
“ Beitriige zur Biologie der Pflanzen,” vol. i. p. 48, found on Potentilla 
argentea, to which he gives the name of Synchitrium Myosotidis var. 
Potentille. 
Next to S. Anemones, perhaps the most common species near Boston 
is that which occurs on Amphicarpea monoica, forming bright yellow 
dots on the surface of the leaves and stems, and which is particularly 
abundant near the veins of the leaves. ‘The plant has been known for 
several years, but its real nature does not seem to have been hitherto 
suspected. In the Curtis Herbarium it figures under the names of 
Uredo Leguminosarum, Lk., collected by Peck (106), at Greenbush, 
N.Y., and as Uredo Fabe, D.C., Georgetown, D.C., Billings (166), 
and Maine, EK. C. Bolles (166). It was described by Peck in the 
24th Report of the New York State Museum, p. 88, as Uredo ecidi- 
otdes, and was later distributed by Von Thiimen as Uredo Peckii, in his 
“ Mycotheca Universalis,’ No, 528. The fungus bears no resemblance 
