502 SUMMARY OF CUKRENT RESEARCHES RELATING TO 



appearance of two sexual organs, and instead of fertilization by two 

 sexual nuclei there is pairing of nuclei. A comparison is made with the 

 developments of TheUbolus. 



New Coremium Penicillium.* — F. Boas found this new fungus in 

 cultures of a fungus on Castanea fruits. The Penicillium not only 

 formed Coremia, but also constantly produced a yellow colour-substance. 

 Culture experiments were made on a large series of substrata, and it was 

 found that the Coremium formation was more vigorous on dry than on 

 liquid media, otherwise the character of the nutrition was not of great 

 importance, though not wholly without influence. The colour produc- 

 tion was very strongly influenced, changing in shade or disappearing 

 altogether. The systematic position is discussed, and Boas finds that it 

 is near to Penicillium corymbiferum. He names it P. Schneggii. 



Notes on Penicillium.t — C. Thorn has published notes on the luteum- 

 purpurogenum group of this genus, so called on account of the colours 

 produced in artificial culture media. Morphologically, these species 

 show close affinity ; the sterigmata are closely branched, and the branches 

 continue as nearly parallel as mechanical conditions permit. The conidia 

 arise as cylindrical cells ; they may become almost globose, but fusiform 

 to elliptical shapes are most common. 



Critical Notes on Species of Dicyma.J — This genus represents the 

 conidial condition of certain species of Ghsetomium or Myxotriclmm, the 

 conidia being borne in clusters, and the setae forming the peridium of 

 the fungus. B. Peyronel has examined the species in which Dicyma 

 occurs, and proposes to unite them under the old genus Ascotrkha. 

 There are three of these species. 



Stagmospora cassavae.§ — P. C. van der Wolk has described a 

 peculiar mould which gave rise to a disease affecting " young slips of 

 Cassava {Manihot utilissima)" It is a wound-parasite, the seat of 

 infection being some cut surface above ground. By tarring all such 

 wounds infection is prevented, and the disease has thus been checked. 

 Cultures of the fungus were made, and Wolk found, in addition to 

 pycnidia of the usual Staginospora type, that endospores were formed 

 within the mycelium, either in rows in the hyphal cells, or in special 

 outgrowths. He came to regard these round bodies as ascospores, and 

 considers that the fungus may be allied to the Protoascinea?. 



Uredinese.— P. Dietel || publishes a note on the cytology of Uromyces. 

 In U. Rumicis he found that the two nuclei of the teleutospore do not 

 fuse before germination, as they do in other teleutospores. He found 

 the same condition present in U. Ficariae. 



0. Trebonn f gives the results of various infection experiments. 



* Mycol. Centralbl. v. (1914) pp. 73-83. 



t Mycologia, vii. (1915) pp. 134-42 (figs.). 



t Ann. Mycol., xii. (1914) pp. 459-70 (3 figs.). 



§ Mycol. Centralbl., v. (1914) pp. 225-30 (10 figs.). 



|| Ann. Mycol., xii. (1914) pp. 422-3. 



If Ann. Mycol, xii. (1914) pp. 480-3. 



