176 SUMMARY OF CURRENT RESEARCHES RELATING TO 



compares it with a brown species, Eiirotimn echimdatum, and gives the 

 characters that indicate the difference between the two species, chiefly in 

 the ascospores, which in Vuillemia's species are marked by lines of 

 verrucfe forming two rings round the centre of the spore. The conidia 

 are also ornamented by brown verrucfe. A. L. S. 



Character of Taxonomic Value in Xylariaceae. — F. Yincens (Bull. 

 Soc. Jfycol. France, 1918, 34, 101-9, 4 tigs.) finds in the spores of this 

 family a furrow along one of the surfaces parallel with the long axis. It 

 is such a constant feature that he considers it indicates tissue relation- 

 ship. He has found it also on the genera RoseUinia and Antho stoma, 

 and would unite these with the Xylarlae. The spores of WaiceUa bear 

 also the same character, but not those of Xylohotryon, which are two- 

 celled ; the ascus also differs from that of Xylaria. A. L. S. 



Organogenic Researches on Hypocreales.— A study of development 

 in Pyrenomycetes has been undertaken by F. Vincens {These Sciences 

 Paris, 191S, 166 pp., 71 text-figs, 8 pis. Lons-C.-Saunier, 1917 ; see 

 Bull. Soc. Mycol. France, 1918, 34, 95-6). His intention was to 

 provide, if possible, a more scientific classification, but for the present he 

 has only examined Hypocreales. He describes the formation of the 

 stromata and of the perithecia within the stromata in Melanospora 

 Mangini, Hypomyces aiirantiacus (which resembles the previous in the 

 later stages), Nectria Rihis (in which the ascogonium degenerates), 

 Hypocrea gelatinosa, Glaviceps microcephala, and Epichloe typhina. He 

 concludes that the group is entirely artificial, and the members onglit to 

 be relegated to other groups of Pyrenomycetes. A. L. S. 



Zygosaccharomyces Nadsonii sp. n. — This new species of yeast with 

 heterogamic conjugation has been cultivated, and is now described by 

 A. GuiLLERMOND {Bull. Soc. Jlycol. France, 1918, 34, 111-22, 4= pis., 

 4 figs.). It was isolated from a syrup of bitter oranges, where it pro- 

 duced active fermentation ; it was cultivated on beer-wort, where it grew 

 freely. The ascospores arise from the union of a large mother-cell with 

 a smaller daughter-cell derived from the former ; they unite by means 

 of a canal, the contents of the small or male cell emigrating into the 

 female cell, which becomes thus an egg-cell. In a short time the egg-cell 

 takes on the character of an ascus cell, and forms one or two or even 

 three ascospores. A. L. S. 



Vegetation of Plicaria leiocarpa.— Leon Dufoue (Bull. Soc. 

 Mycol. France, 1918, 34, 31-3) publishes notes on the development of 

 this fungus. It grows, he says, exclusively on ground that has been 

 devastated by fire at some recent date. Thus, after fires at Fontaine- 

 bleau, the fungus grew in great abundance early the following year, 

 then gradually died out again. Dufour considers that the spores of the 

 fungus could not survive during the long pauses of growth, but that the 

 mycelium must persist at some considerable depth in the soil. A. L. S. 



Three Discomycetes.— J. Chenantais (Bidl. Soc. Mycol. France, 

 1918, 34, 34-40, 1 pi.) publishes an account of Ascophanus cinereus. 



