76 PROCEEDINGS OP THE AMERICAN ACADEMY 



connected with Gym. conicum DC, which does not occur with us in 

 the region where the typical R. cornuta abounds. 



Nos. 277 and 278. Tiie ^cidium nitens of the Syn. Fung. Car. 

 Sup., changed by Schweiiiitz to Cceoma luminatum in the Syn. Fung. 

 Am. Bor., is probably the most striking and brilliant member of the 

 Uredinca; in the Eastern United States, where it is extremely common 

 on several wild species of Riibus, being familiar to every child. In 

 spite of its frequency there is as yet no clue to its connection with any 

 other form. The spermogonia are very abundant, and cover both 

 surfaces of the leaves, and the petioles, looking to the naked eye like 

 minute greenish-yellow glands. They cause a peculiar deformity ot 

 the younger shoots, which become longer and slenderer than usual, 

 and paler in color, and the leaves remain small and unexpaaded. The 

 spermogonia, instead of being wholly or partly immersed in the leaf, 

 as in most species, are entirely above the surface of the epidermis, 

 which rises so as to form a cup, often contracted at the base, leaving 

 the whole body of spermatiferous threads projecting in somewhat 

 club-shaped glutinous masses, either quite naked or covered for a time 

 by the cuticle only. The spermatia are nearly spherical. The spores 

 are arranged in rows like the uredo of Coleosporium, and when fully 

 ripe are somewhat hexagonal in outline, the wall being thinner at the 

 angles. In germination they give off long hyphce from the angles, 

 and not promycelia proper. The present species resembles in many 

 respects the forms placed by Tulasne, in his Second Memoire sur les 

 Uredinees et les Usdlaginees, in the genus C(Soma, using the name in 

 a more restricted sense than Link and Schweinitz, and on that account 

 the generic name Cceoma was given in the North American Fungi. 

 On grounds of priority the specific name nitens should be kept; but, 

 of course, in our ignorance of the connection of this form with others, 

 no generic name can be given which it may not be required to 

 change in a short time. One might sup{^ose that we had here the 

 gecidium of some Phragmidium, as the ascidia of that genus as under- 

 stood by AVinter resemble our plant. I have never been able to trace 

 any connection, however, between our rust occurring early in the 

 season and any subsequently appearing Phragmidium or Coleosporium, 

 and the probabilities are that the species is heteroecious. 



Nos. 247 and 248. Pileolaria hrevipes B. & Rav. Mycologists 

 have been in doubt as to the teleutosporic form of this species. The 

 more common form is the uredo, no. 247, in which the spores are 

 depressed-globose and covered with roughnesses, and it is to this form 

 that the name Pileolaria brevipes was first given. The teleutospores, 



