Eumycetes. — Pfianzcnkrankheiten. 349 



cavity, and a well marked marginal veil exists, in addition to the 

 universal veil. In the second plant, the universal veil breaks down 

 early, and the development ot" the hymenium takes places exposed 

 to the air. 



The observations on Armillaria mellea do not agree with the 

 views expressed by Hart ig. The hymenium is the first part to 

 become differentiated and it arises endogenously. The development 

 is similar to that ot" A. mucida and Agaricus campestris. 



A. D. Cotton. 



Brooks, F. T., The life-history of the Plum-rust in Eng- 

 land. (New Phytol. X. p. 207—208. 1911.) 



A note recording experiments which show that Aecidium punc- 

 tatum (on Anemone coronaria) is the alternate phase of Puccinia 

 Pruni in England, as it is in Russia, and apparently also in 

 the United States. A. D. Cotton. 



Ferdinandsen, C. and 0. Winge. Studier over en hidtil 

 upaaagtet dansk Baegersvamp, Sclerotinia scirpicola Rh em. 

 [Some studies on a hitherto unobserved common 

 Danish fungus], (Biologiske Arbejder tilegnede Eug. Warming 

 den 3 Nov. 1911. p. 281—294 with 7 fig. and an abstract in Eng- 

 lish. Köbenhavn 1911.) 



Sclerotium roseum Fries is found in the spring-time along the 

 shores of the lakes. The germination will be most successful in April 

 on land, but the authors also cultivated it in water with good result. 

 A photonastic impulse is necessary for the formation ofa hymenium, 

 and the ascomata are phototropical. The ascospores of Sclerotinia 

 scirpicola have a thick layer of mucus surrounding the spore-mem- 

 brane, and the primary infection will be sure to take place in the 

 top of the Scirpns lacustris stem just beneath the fiowers. The myce- 

 lium penetrates the stem and develops into the hitherto unknown, 

 though very conspicuous conidial form: Sphacelia scirpicola F. and W. 



From July tili November the mycelium also forms sclerotia in 

 the stems; the sclerotia are formed in descending order in the middle 

 of the stems and their sizes depend on the place in the stem, the 

 Upper ones being smaller than the lower ones. 



Some sclerotia were found in early spring-before the time of 

 their germination-showing marks of former ascomata; accordingly 

 they may be able to winter twice under certain circumstances. 



J. Lind (Copenhagen). 



Grove, W. B., Four little-known British Fungi. (Journ. 

 Econ. Biol. VI. p. 38—42. 2 Plates. 1911.) 



Deals with Monilia [Oidium) lupiili, found occasionally on spent 

 hops in breweries, Hormodendron cladosporoides and Mucor spinosus. 

 A new genus — Rhopalocystis — is formed, for the reception of 

 the dark coloured species of Sterigmatocystis. Amongst the latter 

 S. nigra is specially discussed. A. D. Cotton. 



Brooks, F. T., Silver-leaf Disease. (Journ. Agric. Sei. IV. 2. 

 p. 133—144. 1911.) 



The investigations described strengthen the view that Stereum 



