ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 77 



Lampione, and of Pantelleria, including a list of sixty algge recorded for 

 Lampedusa and thirty-seven for Linosa. Two of them are new to 

 science. 



German Fresh-water Algae.*— AY. Beering publishes the second part 

 (Chlorophyceaj) of his account of the fresh-water algae of Schleswig- 

 Holstein and the neighbouring regions of Hamburg and Lubeck. 

 F. Quelle f publishes an algal flora of Nordhausen. This district was 

 originally worked up by F. T. Kiitzing, whose narrowed notion of species 

 led him to establish them often on what are now held to be but develop- 

 mental forms. Quelle has submitted Kutzing's results to revision in the 

 light of modern botany. 



Fresh-water Algae at Reval. J— G. Schneider and others, in giving 

 a complete biological account of the Obersee at Reval, devote a chapter 

 to its vegetation, which includes a considerable number of fresh-water 

 algae — 17 Schizophyces, 41 Chlorophyceae, 29 Diatomacea? — some of 

 which {Anabama, Clathroajstis, etc.) by the formation of " Wasserblute " 

 (algal scum) give trouble in connection with the Reval water-supply, 

 derived from this lake. In another chapter is given a list of eighteen 

 species which have been found living in the Reval water-supply. In 

 Chapter vi. K. M. Levander treats of the biological conditions which 

 affect the plankton, and indicates the date when each species was noticed : 

 and further, he shows in a synoptical table the comparative degrees of 

 frequency or rarity of each of the species found in the middle part of the 

 lake during the summer months. 



British Desmidiaceae.§ — W. and G. S. West publish the third volume 

 of their monograph of the British Desmidiaceas, including in it full 

 descriptions with figures of 174 species of Cosmarium, with varieties, 

 synonymy, literature, distribution, and critical notes.. Keys to the species 

 are provided, and an additional list of bibliography is appended. 



Rhizoclonium and Cladophora.|| — F. Brand discusses the morphology 

 and biology of the borderland species between the genera Rhizoclonium 

 and Gladophora. Some of these species are stable, and some are transitory 

 morphological phenomena. He describes in great detail Gladophora 

 fracta var. lacustris, which is so variable as to have given rise to the 

 theory that Rhizogonium merges ontogenetically into Gladophora. He 

 then treats of the following in succession : — Rhizoclonium profundum : 

 R. sulfuratum sp. n. ; differential morphology of Rhizoclonium and 

 Gladophora, including an amended diagnosis of the genus Rhizoclonium ; 

 and, in conclusion, the five species of Gladophora which are grouped in the 

 section Affiues, and more or less resemble permanently Rhizoclonium. 



Morphology and Development of Pithophora.l — A. Ernst publishes 

 a contribution to the morphology and physiology of Pithophora, hased 



* Jahrb. Hamburg, wiss. Anstalt., xxv. (1907) beih. 3, 119 pp. \ 



t Mitteil. Thiiring. Bot. Ver., 1908, pp. 33-61. » 



X Arcbiv Biontolog. Berlin, ii. (1908) 192 pp. 



§ London : Ray Society (1908) xv. and 274 pp. (pis. 65-95, partly coloured). 

 || Hedwigia, xlviii. (1908) pp. 45-73 (figs.). 

 U Ann. Jard. Bot. Buitenzorg, vii. (1908) pp. 18-55 (4 pis.). 



