232 SUMMARY OF CURRENT RESEARCHES RELATING TO 



final destruction of these cells gives rise to cavities in which are formed 

 resting-bodies, termed " chronisporocjstes." No sexual process was 

 observed. A. L. S. 



Development of the Spinach Mildew (Peronospora Spinaciae). — 

 Jakob Eriksson (ArJciv. Bot., 1919, 15, Xo. 15, 1-25, 3 figs., 4 pis.). 

 An account of the geographical distribution of the fungus is given. It 

 was described first in England as Botrytis effusa and confused with 

 Peronospora effusa. It has been recorded in most European countries 

 and America. Eriksson discusses and condemns the theories held l:)y 

 various workers as to the over-wintering of the fungus. He then 

 proceeds to give the results of his own cytological researches on the 

 spinach plant. He traces the beginning of the fungus to a mycoplasm 

 in the cell of the host. The history of development is followed through 

 the escape of the mycoplasm from the cell, the formation of hyphffi and 

 sexual organs, and the production of conidiophores and conidia, which in 

 turn initiate new infections. A. L. S. 



Studies in Discomycetes. IL— Jessie S. Bayliss Elliott {Trans. 

 Brit. Mycol. Soc, 1920, 6, 263-8, 30 figs.). The writer publishes 

 critical notes on a number of rare species ; she gives a new and revised 

 description of Dasyscypha conformis, and she judges that Orhih'a 

 coccinella does not differ from 0. Uucostigma var. Xant ho stigma. Asso- 

 ciated constantly with Pyrenopeziza pUcata is to be found Phoma conicoJa 

 sp. n. Mollisia Populi sp. n. was found at Tanworth-in-Arden. 



A. L. S. 



Formation of Conidia and the Growth of the Stroma of Daldinia 

 concentrica. — Jessie S. Bayliss Elliott {Trans. Brit. Mycol. i^oc, 

 1920, 6, 2G9-73, 9 figs.). The author watched the development of the 

 conidia both in nature and in artificial cultures. Observations are 

 recorded on the development of the stroma, the formation of 

 perithecia, and the discharge of the ascospores. The fibrous nature of 

 the stroma is due to tlie arrested growth of perithecia. Any increase 

 in humidity brings about active growth which leads to the formation of 

 a new perithecial layer and atrophy of the preceding zone. A. L. S. 



Aspergillus fumigatus, A. nidulans, A. terreus sp. n., and their 

 Allies. — Charles Thom and Margaret B. Church {Ainer. Joum. 

 Bot., 1918, 5, 84-101, 3 figs.). The authors give an account of their 

 cultural researches on these three related Aspergilli. They fall into two 

 divisions : — A. fumiyatus with simple sterigmata, and the others with 

 compound sterigmata. Each Aspergillus also represents a group. The 

 authors give descriptions of tbem all, a key to the species, and a descrip- 

 tive list of published species belonging to this well-marked series. 



A. L. S. 



Spore Formation in Philocopra coeruleotecta Rehm sp. n. — Hallv 

 Jolivette 8ax {Amer. Joum. Bot., 19 IS, 5, G1-7S, ;5 pis.). The 

 fungus has a minute perithecium and polyspored asci. The research was 

 undertaken to determine the manner of spore formation in such an ascus. 



