Eumycetes. 73 



infection is also probable. In its life-history and cytology the orga- 

 nism agrees closely with 5. Jiinci, the main points of difference 

 being the greater rarity of the true sorosphere, and the more amae- 

 boid form of the organism. A. D. Cotton. 



Seaver, F. J., Studies in Colorado Fungi. I. Discomycetes. 

 (Mycologia. III. p. 57—66. 1911.; 



About sixty species are here recorded as collected in the Rocky 

 mountains about Denver, Colorado. The new species noted 

 are: Ascobolus xylophilits, Dasyscypha Chlorella, nom. nov., Godronia 

 betheli, Ocellaria ocellata; additional notes are sfiven on many others 



R. J. Pool. 



Seaver, F. J., The Hvpocreales of North America. IV. (Mvco- 

 logia. III. p. 207— 230." 1911.) 



In this paper Tribe IV. Cordycipiteae of the author's Classifica- 

 tion is treated. A key to the eighteen species of Cordyceps is given, 

 followed by the specific descriptions, etc. Seven species of Sper- 

 moedia are noted in the key to this genus, and one species of 

 Balansia. New species are : Spermoedia Stevensii, nom. nov., 5. Rolfsii, 

 S. tripsaci. The genus Cordyceps is illustrated in two plates of twenti- 

 five figures. A useful index is here provided to the complete list of 

 papers on these fungi as thev have been published in Mycologia I: 

 41—76, 177—207, 1909 and Mvcologia II: 48-92, 1910 and III. 207- 

 225. 1911. " R. J. Pool. 



Stevens, F. L. and J. G. Hall. Carnation Alternariose. 

 (Bot. Gaz. XL VII. p. 409-413. 1909.) 



Some cultnral work was done upon a species of Alternaria 

 causing serious diseases of Dianthus Caryophyllns in North Caro- 

 lina. The writers indicate the Symptoms of the disease, and describe 

 their inoculations and culture characters. The causal organism in 

 this case is described as a new species: Alternaria Dianthi. Eight 

 figures accompany the paper. R. J. Pool. 



Stevens, F. L. and J. G. Hall. Variation of Fungi due to 

 Environment. (Bot. Gaz. XL VIII. p. 1—30. 1909.) 



The object of the study here reported was to call attention to 

 the kind and degree of environmental Variation found in a few 

 species of fungi that have been studied by the authors for four 

 years, and to attempt to analyze the causes of the variations. Such 

 factors as density of the colony, light, and density of the mycelium 

 were studied. Among the general conclusions we find that if a 

 fungus can be easily changed as regards its essential descriptive 

 characters by a change in the substratum by the density of infection, 

 ör other environmental factor, these characters are worthless for 

 descriptive purposes, unless the conditions under which they develop 

 be accurately known. Life history work and infection work are very 

 valuable , but the recognition of the form in question is- a necessary 

 preliminary even to this. It seems that to reach any satisfactory 

 basis many fungi must be studied in culture under known suitable 

 conditions, which might perhaps be standardized, much after the 

 fashion that bacteria are now studied. Only a very little experience 

 with fungi either in the field or laboratory is necessary to show 



