822 PROCEEDINGS OF THE AMERICAN ACADEMY 



De Bary * and Schroeter,t and to European specimens which I have 

 examined. In Europe it is said to occur only on the under side of 

 the leaves, although Schroeter mentions its occurrence on petioles and 

 young stems of L. pahistre. Mr. Faxon's specimens consisted of 

 leaves of L. latifolhim without stems. Schroeter states that he has 

 seen a small specimen from Labrador on L. latifoUum which was the 

 same as the form on L. paluslie, but no mention is made of epijihyllous 

 pori. Tiie fungus is also said by Rostrup % to have been found on L. 

 palustre in Greenland. Whether our epiphyllous form should be con- 

 sidered distinct from the hypophyllous, must, for the present, remain 

 uncertain. I found the differences stated above constant in all the 

 specimens I examined, and they were not few in number. It may be 

 that the two forms are modifications of the same species depending on 

 the different structure of the upper and under side of the leaves, but 

 the differences are certainly greater than those of many forms which 

 are regarded as distinct by good mycologists. It is, in all events, in- 

 teresting to know that we have in the Wliite Mountains both the uredo 

 and teleutosporic forms of Chrys. LecU growing in close proximity to 

 Abies nigra in regions where it is badly infested with a Peridermium 

 which, as stated in my paper already referred to, I am unable to dis- 

 tinguish from P. abiedniim, one form of which is said by De Bary, in 

 his exhaustive paper on the subject, to be the jccidium of Clirys. Ledi. 

 The teleutospores were found only in the first set of leaves collected 

 by Mr. Faxon, it will be remembered, while the uredo was collected 

 later. The finding of the teleutospores before the uredo may, in this 

 case, have been merely accidental, and does not show that the uredo 

 was developed later than the teleutospores. Cases have, however, 

 been cited by De Bary, in which the uredo certainly did not develop 

 until after the teleutospores. 



In this connection it should be noticed that a new ^cidium pseudo- 

 cnlamnare from the Black Forest has been described by Prof. J. 

 Kuehn, in Hedwigia, November, 1884. The species is said to be 

 characterized by having white spores, and one is inclined to ask 

 whether this may not be the same as Peridermium holsamenm Peck, 

 of the White INIountains and the Adirondacks, which is distinguished 

 from ^. culumnare by having white spores. 



Besides our common Chrysnmyxa on Pyrola, a species was found 

 on Abies Canadensis at Chebacco Lake^ Essex Co., Mass., by Mr. 



* Bot Zeit., xxxvii. 802. . J Revue Mjcologique, vi. 210. 



t Beitr. zur Biol, der Pflanzen, iii. 52. 



