288 



Mycologia 



of the larger fungi which attack this' valuable tree has cor- 

 respondingly increased. Polyporus igniarius, P. foment onus, P. 

 hispidus, P. cinnabarinus, P. sulphur eus, and certain other fungi 

 are mentioned among the enemies of the walnut, but, strange to 

 say, Favolus europaeus is considered the most virulent of them 

 all. It gains entrance through wounds in the branches. The only 

 known method of treatment is to remove all diseased branches 

 and cover the cut surfaces with grafting wax. This species is 

 known to be fond of our native hickory trees and should be 

 further investigated. 



Burt's paper on Aleurodiscus in the Annals of the Missouri 

 Botanical Garden for September, 1918, includes 14 North Ameri- 

 can species, all of which are illustrated by text-figures showing 

 microscopic characters. According to the author, 25 species 

 have been recognized for the genus : 8 in Europe, 5 in Asia and 

 Australia, 2 in Africa, and 2 in South America. Most of our 

 species are of local distribution. They are as follows : Aleuro- 

 discus amorphus (Pers.) Rabenh. ; A. Farlozvii Burt sp. nov., 

 on dead hemlock twigs in New Hampshire -and New York; A. 

 Oakesii (Berk. & Curt.) Cooke; A. apiculatus Burt sp. nov., on 

 fallen dead wood in Jamaica, Porto Rico, and Grenada; A. can- 

 didus (Schw.) Burt comb. nov. ; A. strumosus (Fries) Burt comb, 

 nov.; A. seriatus (Berk. & Curt.) Burt comb, nov.; A. nivosus 

 (Berk. & Curt.) v. Holm. & Litsch. ; A. acerinus (Pers.) v. 

 Hohn. & Litsch.; A. botryosus Burt sp. nov., on dead stems of 

 Rubns and Vitis in Massachusetts, Maryland, and Mexico ; A. 

 cremeus Burt sp. nov., on dead oak wood in New Mexico; A. 

 tenuis Burt sp. nov., on dead twigs in Cuba; A. penicillatus Burt 

 sp. nov., on dead wood of Pseudotsuga and Tsuga in Idaho, 

 Washington, and Oregon; and A. Weirii Burt sp. nov., on decay- 

 ing wood of Abies, Thuja, and Larix in Idaho and British 

 Columbia. 



The North American species of the genus Hymenochaete are 

 treated by Burt in the Annals of the Missouri Botanical Garden 

 for November, 1918; the majority of the 37 species included 



