670 SUMMARY OF CURRENT RESEARCHES RELATING TO 



except one, after having undergone mitosis. The single nucleus passes 

 with plasma through the elastic fertilizing tube into the ooplasma, and 

 fuses with the female nucleus. When the oospore is mature, granules, 

 which :ire evidently fat-centres, are scattered through the plasma. 



The oospore is uninucleate, and contains as nutriment a fat-globule 

 which has a membrane and evidently also a stroma. After six months 

 resting period the oospore germinates with a tube which immediately 

 branches. 



Parasitic Root-diseases of the Juncacese.* — P. Magnus criticizes 

 a paper by E. J. Schwartz on this subject, in which the latter had stated 

 that Magnus had placed a fungus causing the tubercles on the roots of 

 Juncus articulatus in the genus Schinzia, and that Weber had named it 

 Enorhiza cypericola, which Schwartz endorses. Magnus denies these 

 statements, and gives his reasons for doing so. 



Sclerotinia as a Plant-disease. f — Joh. Westerdijk records the 

 appearance in Holland of Sclerotinia Libertiana on Lactuca sativa and 

 other cultivated plants. Continued saprophytic life does not impair its 

 capacity to turn parasite. Infection takes place through wounds, and 

 in moist weather ; Botrytis cinerea is not the conidial form. The 

 sclerotia often develop mycelium and not ascospore fruits, and the 

 Peziza form does not develop in artificial cultures. 



Studies in Ascomycetes.J — Ed. Fischer has made a resume of work 

 done recently on Tuberineae and Helvellineas, tracing the relationships 

 between members of these groups and between the groups themselves. 

 It has been found as a result of researches that there is no great differ- 

 ence between Balsamiacere and Eutuberinere, nor between Pezizacea? 

 and Helvellacese. The reasons for these decisions are given, and the 

 different research-workers referred to. 



Plicaria Planchonis Boud.§ — J. Lagarde found, in November 1910, 

 a number of specimens of a dark violet-coloured Peziza on the soil at 

 Montpellier, measuring across from 2 mm. to 3 c. He found it to be 

 identical with authentic drawings of Aleuria atro-violacea, and also 

 synonymous with Ascobolus Persoonii. The spores are spherical : the 

 hymenium is coloured blue-violet. A coloured plate of the fungus is 

 given. 



Hypocrea rufa.|| — M. Medisch isolated from the soil the fungus 

 Trichoderma viride, the conidial stage of H/jpocrea rufa, and with it he 

 made a series of culture experiments. In a weak medium of glucose 

 there is a continual oxidation shown by the colour changes. An addi- 

 tion of various salts to the culture quickened the formation of colouring 

 matter. It began with yellowish green or screen, and changed to yellow 

 or orange, and Medisch considered these changes as stages of oxidation. 



* Hedwigia, 1. (1911) pp. 249-52. 



+ Med. Phytopath. Lab. " Willie Commelin Schoiten," ii. (1911) 28 pp. (2 pis.). 

 See also Ann. Mycol., ix. (1911) pp. 309-10. 



% Zeitschr. Bot., ii. (1910) pp. 718-22. 



§ Bull. Soc. Mycol. Prance, xxvii. (1911) pp. 39-43 (1 pi.). 



|| Jahrb. Wiss. Bot., xlviii. (1910) pp. 591-631. See also Bot. Centralbl.. cxvii. 

 U911) pp. 91-2. 



