46 Thirty-fourth Annual Eeport of the 



growth some of them appear to be pressed into a somewhat angular 

 ovate or broadly elliptical shape. The host plant does not suffer ma- 

 terially from the attacks of the fungus, the affected ones growing as 

 large as the unaffected and their leaves retaining their ordinary green 

 color except in the affected spots. Occasionally a Peronospora is found 

 on the spots, an indication, perhaps, that the supposed Protomyces 

 spores may be after all only the resting spores (oospores) of a Peronos- 

 pora. 



Roestelia penicillata, Rabh. Leaves and unripe fruit of the shad 

 bush, Amelanchier Canadensis. Highlands. June. 



iEcidium pedatatum, Schw. Living leaves of violet, Viola pedata. 

 New Dorp, Staten Island. W. R. Gerard. 



Helicomyces mirabilis, n. sp. (Plate 2, figs. 6-10.) Forming dense 

 tufts or irregular whitish patches one line or more in diameter ; flocci 

 slender, branched, colorless, the fertile ones sometimes coiled and 

 slightly thickened near the spore ; spores abundant, large, spirally or 

 irregularly coiled in two or more volutions, multiseptate, the cells 

 about as broad as long, either filled with a granular endochrome or 

 containing a single large nucleus ; coils .0016 in. to .0025 in. in diame- 

 ter ; spores .0005 in. to .0006 in. broad. Old corn cobs lying in water. 

 Ithaca. Prentiss. The tufts or masses occur mainly on the erect 

 scales of the cob. In the dry state they are rather firm and compact. 

 The septa of the spores are variable in number, ranging from six to 

 sixteen or more. Unlike typical Helicomyces, this species has the 

 threads lo'ng and well-developed. 



Septocylindrium Ranunculi, n. sp. Spots oblong or irregular, 

 brown ; flocci hypophyllous, very short ; spores oblong or subcylindri- 

 cal, usually narrowed in the middle, obtuse, colorless, simple or one to 

 three-septate, .0008 in. to .0016 in. long. Living leaves of buttercups, 

 Ranunculus acris. Sandlake. Sept. This species is ambiguous be- 

 tween Cylindrium and Septocylindrium. Many of the spores are sim- 

 ple, others are obscurely uniseptate and others still show three septa. 

 Possibly the simple spores are immature, and on this supposition I 

 have referred the species to Septocylindrium ; otherwise this fungus 

 would obliterate the distinction between Cylindrium and Septocylin- 

 drium. 



Ramularia Spiraeae, n. sp. Spots indefinite, scattered or confluent, 

 brown or blackish-brown ; spores hypophyllous, concatenate, oblong 

 or cylindrical, colorless, variable in length, .0003 in. to .001 in. long, 

 .00012 in. to .00016 in. broad, generally with a minute nucleus near 

 each end. Living leaves of nine-bark, Spiraea opulifolia. Albany. 

 Sept. The strings of spores are well-developed, and in some instances 

 branched. 



Ramularia rufomaculans, n. sp. Spots numerous, often confluent 

 and occupying nearly the whole leaf, dull-red ; flocci very short, hy- 

 pophyllous tufted; spores concatenate, variable, elliptical oblong or 

 cylindrical, colorless, .0003 in. to .0006 in. long, .00012 in. to .00016 

 broad. Living leaves of Polygonum amphibium var. terrestre. Al- 

 bany. Sept. The chains of spores are sometimes branched. The 

 species is closely related to R. Bistortm, from which it is separated be- 

 cause of the different character of the spots and the different and varia- 

 ble character of the spores. Sometimes the spots have a paler or 



