PAPERS GIVING RUSTS OF NORTH AMERICA. 239 



Represented by four leaves, one of them 4 by 6 cm., the others 

 trimmed down to that size from larger leaves, mounted loose in a 

 packet, bearing seven characteristic galls, and by an original packet 

 with eight similar leaves, 4-7 cm. long, having bleached spots but 

 no rust, which is labelled "-licidium (Ceratites) Botryapii LvS 

 Bethl 1830." 



The rust is the secial stage of Gyiiuiosporangiimi botryapites 

 (Schw.) Kern. At page 310 of the same work Schweinitz changed 

 the name to Ceratites (Cceonia) botryapites. The asterisk was er- 

 roneously omitted from this number. 



8. Subgen. peridermium. 



2903. 93. C. P. Pineum, Lk. 175, Syn. Car. 456. In Pennsylvania near 



Philadelphia and elsewhere, not rare. Specimens ample, a foot 



long, found by me on the trmik itself of Pinus inops, suggesting 



a resemblance to Gymnosporangium Juniperini. 



(456. 27. [/Ecidium] Pini. Rare with us, and only on 5'oung 



leaves.) 



Represented by two specimens. One of these consists of the sec- 

 tion of a woody gall, 3 cm. across, mounted, with an empty packet, 

 labelled " Cseoma Peridermium Pini in Ligno Philad." A similar 

 portion of a gall is in the Michener collection at Washington, prop- 

 erty of the U. S. Department of Agriculture. 



The other consists of about a dozen slender leaves from a 2-leaved 

 pine, none full length, now about 5.5 cm. long, mounted loose in a 

 packet, bearing a few aecia. with an empty packet, labelled " Cseoma 

 Peridermium Pini in acubus Salem." 



Microscopic examination shows the woody form to be Perider- 

 mium cerebrum Peck, the ?ecial stage of Cronartiiim Oiiercus 

 (Brond.) Schrot., and the leaf form to be P. intermedium Arth. & 

 Kern. 



*2904. 94. C. P. germinale, L.v.S., very rare on the fruits of roses. Com- 

 municated to me by Mr. Collins. 

 C. pseudoperidia very long, cylindric, somewhat compressed, at 

 length white, fimbriate, divisions cleft to the bottom, free. 

 Spores efifuse, pale. Pseudoperidia rising from little pits in the 

 fruit, without any spot, usually three lines long. 



