40 



Mycologia 



A new disease of Paidownia tomentosa, caused by Valsa Paul- 

 owniae, is described by Takewo Hemmi in a recent number of 

 The Botanical Magazine of Tokio, Japan. This disease attacks 

 the branches and trunks of Paidownia tomentosa without regard 

 to its age, but the young trees three or four years old are most 

 liable to attack. In the case of a young tree, the disease appears 

 first at the tip of the clear trunk in the early spring. The bark of 

 the affected part turns brown in color, as if killed by freezing. The 

 discolored portion gradually increases its area, extending down- 

 ward toward the thicker portion of the stem. From May to June, 

 the disease progresses most rapidly, and in consequence the tree is 

 killed, with an appearance of " die-back." The fungus enters the 

 tree through a wound having a layer of dead cells on its exposed 

 surface, in which a mass of mycelium is first formed. In the 

 vicinity of Sapporo, the winter injury due to the very low tem- 

 perature is the most common and powerful agency in inducing 

 the spread of this disease. 



New Combinations 

 Most of the new species published in North American Flora, 

 volume 9, part 6, belong to the genus Clitocybe, which is com- 

 monly accepted by mycologists. For others, the following new 

 combinations are here proposed : 



Hydrocybe californica = Hygrophorus californicus 

 Camarophyllus angustifolius = Hygrophorus angustifolius 

 Camarophyllus auratocephalus = Hygrophorus auratocephalus 



The only species published in Mycologia last year that need be 



recombined is the following, described on p. 113: 



Melanoleuca olivaceiflava = Tricholoma olivaceiflavum 



Species published in Mycologia for 191 5, on pp. 44 and 222, 



may be recombined as follows : 



Rostkovites caclifornicus — Boletus californicus 

 Gymnopilus farinaceus = Flammula farinacea 



W. A. MURRILL. 



Two New Species of Fleshy Fungi 



Gymnopus Ellisii Murrill, sp. nov. 



Pileus minute, convex, becoming depressed, gregarious, 2 mm. 

 broad; surface milk-white, dry, minutely pubescent, margin at 



