BULLETIN OF THE BUSSEY INSTITUTION. PAE 
ascertain, the species has not been, as yet, described: We would 
propose for it the name of Synchitrium papillatum.* 
PERONOSPORE®. — Of the species of Oystopus, mentioned in the 
* Bulletin,” vol. i. p. 429, OC. eubicus, Mart., has been found to be 
common on salsify (Zragopogon porrifolius) near Boston; in fact, so 
common as to excite fears in the minds of farmers that the crop might 
be destroyed. Oystopus Bliti, Bivon, common on species of Amaranth, 
has been observed on Acnida cannabina, L., in brackish marshes in 
Cambridge, both conidia and odspores being abundant. 
Of the species of Peronospora, several have been added to the list 
of those previously known to inhabit the United States. P. pygmea, 
Ung., is common on the leaves of the wood anemone (A. nemorosa) iit 
early summer. The form found in this country does not differ from 
the type as it occurs in Europe. With regard to the germination of 
the conidial spores, the following was noticed. When entirely sub- 
merged, the whole contents of the spore are first discharged, and then 
the germinal tube grows from one end of the discharged mass. 
When, however, the spores. lie on the surface of the water, the 
germinal tube grows directly from the spore itself. Another species 
not uncommon on Ranunculus acris is P. Ficarie, Tul., which 
bears a close resemblance to P. effusa, Grev., of which it appears 
like a dwarf form. Both conidia and odspores were found on 
P. acris, and the American form does not differ from the European 
type. The same is true of a third species, P. Potentille, De Bary, 
found on seedlings of Potentilla Norvegica, growing in a wet meadow 
at Newton, late in October, 1877. The fungus was luxuriant, ‘and 
both conidia and odspores were abundant. 
In Vol. I. p. 428, of the “ Bulletin,” reference was made to a 
Peronospora on Plantago major, found at Newton, Mass. Since then 
we have been able to compare the Newton specimens with specimens 
of P. alta, Fuckel, and find that they are the same species. We must 
confess, however, that P. alta approaches very closely to P. effusa, 
Grey., to which the Newton fungus was at first referred. The New- 
* Synchitrium papillatum, n. sp. Resting-spores .065-.075 mm. by .04-.05 
mm., 1-3 in a cell, brownish, epispore roughened; epidermal cell externally 
elongated into an obovate, pyriform sac, surface raised in blunt papille ; zod- 
sporangia brownish, very numerous, in spherical cells. On leaves of Erodium 
cicutarium collected on the Island of Guadalupe, California, by Dr. E. Palmer. 
