ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 101 



localities, which add more exact knowledge couceruiiig the distribution 

 of the group in France. He further discusses Nitella confervacm and 

 Chara vulgaris, grouping their different forms according to more precise 

 morphological characters, and describing new ones. 



Marine Flora of Tatihou and St. Vaast-la-Hougiie.* — P. Hariot 

 records three new species for this region, Gordijledadia ere'ia, Phyllo- 

 pliora Trdillii, ErytUrotriclwi Weltritschii, and at the same time notes the 

 disappearance of certain other species. The station of Tatihou lends 

 itself to the study of the development of certain algffi ; notably, Chorda 

 Mum, Padina pavonla, colonies of Schizonema, etc. The author adds 

 interesting observations ou the growth of Fucuh. 



Alternation of Generations.! — J. Bonnet writes on the sexual 

 reproduction and the alternation of generations in alg^, and gives a full 

 summary of all that is known on the subject. He argues that since the 

 alga3 are a more or less chaotic group, is it not wise to attempt to bring 

 order into the chaos by following the guiding line of alternation of 

 venerations ? 



Fungi. 



(By A. LoRRAiN Smith, F.L.S.) 



The Ferax Group of Saprolegnia.J — A. J. Pieters has cultivated 

 a large series of forms of this group, all of which were considered by 

 Pringsheim to be varying forms of one species. His results have led 

 him to conclude that there are a number of species represented, all 

 closely related, but with distinct characters that persist through many 

 culture generations. Of these S. monoica has the most complete 

 sexuality : S. mixta less so, with a more delicate mycelium : while in 

 S. ferax the loss of sexuality has gone further than in the two former 

 species. 



New Species of Empusa.S — B. Majmone found the new fungus 

 E. elegans on Forthesia ckrysorrhcea. It differs from E. muscse in the 

 shorter conidiophores, and the very large chlamydospores which are 

 developed within the larval body. Inoculation of living larvae failed, 

 as did cultures on substrata formed of cooked specimens. Evidently 

 only mummified larvse are attacked, and to that extent the fungus is 

 saprophytic. 



Study of Tarichium.|| — This fungus, one of the Entomophthoreai, 

 now studied by G. Lakon, probably is a stage in the development of 



* Comptes Rendus, clix. (1914) pp. 689-92. See also Bot. Centralbl., cxxix- 

 (1915) p. 62. 



t Progr. Rei. Bot., v. (1914) pp. 1-128 (figs.). See also Bot. Ceutralbl., cxxix. 

 (1915) pp. 439-40. 



+ Mycologia, vii. (1915) pp. 307-14 (1 pi.). 



§ Centralbl. Bakt., xl. (1914) pp. 98-109. See also Bot. Centralbl., cxxix. (1915) 

 p. 644. 



II Zeitschr. Pflanzenkr., xxv. (1915) pp. 257-72 (8 figs.). 



