336 Fungi. Myxomyceten , Pathologie. 



Hsdgcock, G. G. and P. Spaulding, A new method of 

 mounting fungi grown in cultures for the herbarium. 

 (Journ. orMj'Col. XII, p. 147. 1906.) 



* The fungus is grown in Petri dish cultures and the agar cut 

 into small blocks and placed fresh upon index cards., then allowed 

 to dry. The fungus js protected by a piece of cardboard with a 

 round hole cut in the middle large enough to receive the agar. 

 This is pasted down and prevent other sheets from rubbing directly 

 upon the fungus. Perley Spaulding. 



Hook, J. M. van, Blighting of field and garden peas. (Ohio 

 Agric. Expt. Station Bull. CLXXIII. p. 231-249. April 19Ü6.) 



The blight of peas caused b}^ Ascochyta pisi Lib. has been 

 known for many years but in 1904 the damage was apparentl}-- 

 greater than usual and caused complaint. It was first noticed June 24, 

 1904 when the peas were about two feet high and just in bloom. 

 The lower leaves were dead and some of the plants wilting. Many 

 of the Sterns were found to be attacked near the ground but also higher 

 up. The leaves and pods may also be diseased and the most part of 

 the investigation was that in which it was shown that the mycelium 

 grows frequently into the seeds directly through the seed coats so 

 that the succeeding crop is sure to be diseased even worse than the 

 first. In pure cultures the fungus grows readily and in seven days 

 time the pycnidia containing mature spores may be produced. Seed 

 treatment b}^ immersion was unsuccessful. For the purpose of obtai- 

 ning seed peas free from the disease the vines were tied up and 

 sprayed , with fair success. All varieties of this species were attacked 

 but the Alaska seemed to be quite resistant, being only sligthtly 

 diseased. An examination of seventeen leguminous plants showed 

 that Liipinns alba and Scotch Gray Pea {Pisum arvense var.) were 

 but slightly affected on the leaves while French June Pea {Pisum 

 arvense var.) was very badly diseased. Russian Blue Pea [Pisum 

 arvense var.) was free both in 1904 and 1905. During 1905 the disease 

 was reported from nine counties of the State but it doubtless was in 

 every one. Another serious disease of the pea is caused by Erysiphe 

 communis (Wallr.) Fries and is known as the powdery mildew. The 

 loss from this trouble the last season was quite large. This also 

 lives over winter on the seed. Fungicides however will prevent this 

 from becoming serious as the mycelium is mostly exterior 



Perley Spaulding. 



Kellerman, W. A., A new Plowrightia from Guatemala. 

 (Journal of Mycology XII. p. 185-187. pl. 90. Sept. 1906.) 



A description of a fungous disease of the American Century 

 plant Agave americana is given. The disease is caused by the 

 fungus Plowrightia WiUiamsoniana fKellerm. n. sp. which is described 

 and figured. The Clusters of fruiting bodies are striking on account 

 of their size and red or yellowish red color which changes later to 

 brown and finally black. The stromata are arranged in concentric 

 rows like those of Colletotrichum agaves Cav., which is also reported 

 from Guatemala. Hedgcock. 



