DISEASES OF PLANTS. 341 



Pourth supplementary list of parasitic fungi of "Wisconsin, J. J. Davis 

 (Trans. Wis. Acad. Set., Arts, and Letters, 16 (1909), pi. 2, No. 1, pp. 739-772).— 

 This is a list of species, mostly recorded before, but not as growing on the hosts 

 here given, also new species with their hosts, as follows : Phyllosticta disdncta 

 on Uvularia grandiflora and Smilacina spp., Cercospora epigccina on Epigcea 

 repens, Cylindrosporium betiilw on Betula pumila, C. ribis on Ribes spp., Qloeo- 

 sporium thalictri on Thalictrum dasycarpum, Phyllosticta apicalis on Salix 

 liicida, P. diervillw on Diervilla triflda, P. mulgedii on Lactuca leucophwa, 

 Raviularia paulula on HypeHcum virgi/nicum, and Septoria parietarice on 

 Parietaria pennsylvanica. 



An index of hosts is also given. 



Some fungus diseases of field crops, W. Loch head (Ann. Rpt. Quebec Sac. 

 Protcc. Plants [etc.], 3 (1910-11), pp. 67-77, figs. 5). — A description is given of 

 loose smut of oats, loose smut of wheat, stinking smut of wheat, loose smut of 

 barley, covered smut of barley, and corn smut, with some suggestions for their 

 treatment. 



Some contributions to the life history and cytology of the smuts, B. F. 

 LuTMAN (Trans. Wis. Acad. Sci., Arts, and Letters, 16 (1910), pt. 2, No. J^, pp. 

 1191-12^iJi, pis. 8). — After a brief account of previous investigations on the char- 

 acteristics and probable relationships of the various groups of smuts (B. S. R., 

 23, p. 345), the author gives the results of his own studies on the life his- 

 tory and cytology of certain species of Ustilago, Urocystis, Doassansia, and 

 Entyloma. 



As a result of these investigations he claims that characteristics of the 

 Ustilago group, such as the simple spores produced by the breaking up of the 

 Diycelium, the multinucleated mycelium during the entire life cycle, the inter- 

 cellular mycelium without haustoria, and the typically four-celled promycelium 

 are in striking contrast with the elaborate and varied spore balls, the spores 

 produced on lateral branches, the haustoria, the presence of binucleated cells, 

 and the nonseptate promycelium found in the Tilletia, Entyloma, and Urocystis 

 division. The general conclusion is reached that the 2 divisions of the smut 

 group may be more distantly related than is commonly supposed. 



F. Zach's investigations on the rust spots of the grains and the mycoplasm 

 theory, J. Eeiksson (Sitzber. K. Akad. Wiss. [Vienna], Math. Naturiv. Kl., 119 

 (1910), I, No. 9-10, pp. 1043-1050) . — After a brief mention of some previous 

 discussions of his theory of a mycoplasm, the author considers the citations 

 and investigations of F. Zach (E. S. R., 25, p. 652). 



It is claimed that the mycelial threads observed and described belong to a 

 later stage of development of the fungus than the mycoplasm stage. This the 

 author has verified by later investigations of like materials under higher mag- 

 nifications, and he claims that his theory is not impaired by results so far 

 published. 



Botryosphseria on cotton bolls, C. W. Edgkrton (Mycologia, 4 (1912), No. 1, 

 pp. 34-36). — The author reports among the fungi of minor importance on 

 cotton bolls a pyrenomycete which has been provisionally referred to B. 

 fuUginosa. 



In making a study of some of the diseases of cotton, the author found this 

 fungus on cotton bolls in Louisiana and began a study of the life history to 

 determine its connection with some of the imperfect fungi which are instru- 

 mental in causing boll rots. Two stages of the fungus have been found, a 

 pycnidial one, which belongs to the genus Macrophoma, and the perfect or 

 ascogenous stage, which is described at some length. 



Inoculation experiments were undertaken to prove the identity of the 2 

 forms, and as a result the author claims that the 2 stages belong to the 



