346 EXPERIMENT STATION RECORD. tVol. 41 



New or interesting' species of fungi, IV, H. D. House (A'. Y. 8tatc ilus. Bui. 

 197 (1917), pp. 25-51). — Some of the fungi here named as new to the flora of 

 New York, with brief descriptive discussion, are parasitic and a few may be of 

 economic importauce. 



On cell regeneration in Botrytis cinerea, W. B. Brierley (Ann. Bot. [Lon- 

 don'\, 32 (1918), No. 128, pp. 601-604, flys. 3). — In the course of an investigation 

 of B. cinerea the author noted that regenerative and related changes occurred 

 in cells which had suffered division, severe fle:iion, or other injury. Recovery 

 was observed. It is stated that the healing process and the rapidity of its 

 occurrence depended largely upon age and condition of the cells involved, 

 being hindered by starvation, for example. The regenerative response appears 

 to be related largely to the condition of vacuolation of the protoplast. Tj-pes 

 of injury stimulating a healing reaction are divided into acute cell flexion, 

 punctures, and relatively large superficial lesions. It is thought that this 

 potentiality, if widely distributed among the fungi, may have important 

 bearings. 



It is stated that certain hyphse of B. cinerea in tissues of JEsculus pavia 

 were found to be in a naked condition, existing as free protoplasmic substance. 

 The author holds, however, that mycoplusm involves far more than the mere 

 existence of fungus protoplasm in a naked state, and that the merging and 

 subsequent dissociation of host and fungus must be regarded as not yet 

 established. 



Blossom infection by smuts, C. N. Jensen (Trans. Vtah Acad. Sci., 1 (1908- 

 1917), pp. 106-113). — The author, summing up a review of work on smuts, 

 states that, in addition to seedling infection, other forms exist, as blossom 

 infection and leaf infection. As a rule, attack occurs only in very young 

 embryonic tissues which are exposed at various points during growth. The 

 flowering period offers an opportunity for infection comparable to that of 

 seedling infection, so that these two distinct forms of attack at different 

 periods have to be reckoned witli. 



The black or stem rust of wheat (Canada Expt. Farms Bui. 33, 2. ser. 

 (1917), pp. 15, fig. 1). — An account is given of the nature and cause of tlie 

 black stem rust of wheat, together with suggestions for its control. These 

 include eradication of the common barberry, early sowing of wheat, and the 

 use of early maturing varieties. Most satisfactory results have been obtained 

 where early maturing varieties were sown on high or sandy lands. 



Destroy the common barberry, E, C. Stakman (U. S. Dept. Ayr.. Farmers' 

 Bui. 1058 (1919), pp. 12, flys. 7). — The relation of the common barberry as a 

 carrying host to the black stem rust is pointed out, and its destruction is 

 recommended as at least a partial means of reduction of loss in crops. 



The leaf-spot diseases of alfalfa and red clover caused by the fungi 

 Pseudopeziza medicaginis and P. trifolii, respectively, F. R. Jones (U. S. 

 Dept. Ayr. Bui. 759 (1919), pp. 38, pis. 3, figs. 5). — This bulletin is a contribu- 

 tion on the study of alfalfa and clover diseases being carried on cooperatively 

 between the Bureau of Plant Industry of the U. S. Department of Agriculture 

 and the Wisconsin Experiment Station. 



The author describes the alfalfa leaf spot (P. medicaginis) said to be the 

 most important foliage disease of alfalfa, and a similar leaf-spot disease of 

 the red clover due to P. trifolii. Both fungi have been obtained and studied 

 in pure culture, and efforts to cross these fungi from one host to the other 

 have been unsuccessful. The author claims that morphological as well as 

 physiological differences have been found which justify retaining the fungi 

 as distinct species. No imperfect fungi which have been regarded as a stage 

 in the development of these fungi have been found to be related. 



