ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 203 



" Knee-joint " of Mougeotia.* — J. A. Nieuwland has studied " knee- 

 joints " iu several species of Mougeotia, and comes to the conclusion that 

 it does not represent a stage in coujugation, for the joints are present 

 only in vegetative stages, and never in typically conjugating material. 

 " Usually the cells of the filament hold together so firmly that the cells 

 break through the middle rather than separate at the ends ; but in ma- 

 terial with the knee-joints, the cells are easily dissociated, and, succeeding 

 the appearance of the joints, the amount of material increases enormously, 

 so that the joints seem to be related to vegetative multiplication." 



Algae of Haute-Savoie.t — L. Viret publishes a list of sixty-three 

 species collected on the mountain groups of La Tournette, La Filliere, 

 and Les Aravis. The localities are briefly described, with their altitudes. 

 Critical notes are added to some of the records. 



Chrysomonadineae of Bohemia.! — A. Pascher has worked out the 

 species of this group found iu Bohemia, and enumerates thirty-nine 

 species. Five varieties are new. 



New Genus of Chrysomonadineae.§ — A. Pascher describes a new 

 genus of Chrysomonads, Pyramidochrysis, found by him in the old bed 

 of the Olsch river, in southern Bohemia, in 1909. The cells are pyriform- 

 oval, somewhat rounded off at the base, and at the forward end more or 

 less abruptly narrowed. A detailed description is given of the genus. 

 Movement takes place by means of a single cilium, and the genus belongs 

 therefore to the Chromulinaceae. The movement of the cilium is pecu- 

 liar, and resumbles that of Peranema. Pyramidochrysis appears to be 

 holophytic, and the well-developed chromatophore is sufficient for pur- 

 poses of assimilation. Division takes place along its length : the process 

 is described. Resting-states were observed, but the germination of these 

 cysts was not seen. Two species are described, P. splendens and P. 

 modesta. 



Ourococcus bicaudatus.|| — A. E. Grobety writes a short account of 

 this alga, hitherto known as Dactylococcus bicaudatus Braun. She gives 

 a short history of the species and of the confusion which has arisen as 

 to its characteristics. Hansgirg has united it with Gharaciwn pyriforme, 

 making it a variety. As a result of growing 0. bicaudatus in a culture, 

 the author finds that it differs from Scenedesmus by the absence of a 

 cenobium ; from Lagerheimia by its single prolongation, irregularly dis- 

 posed ; from Raphidium by its gibbous form (ventrue) and its asymet- 

 rically disposed points, which terminate the cell irregularly. The cells 

 of this species which have two prolongations are not a variety, but merely 

 one of the forms resulting from division, a process which is described by 

 the author. 



Green Snow. If — R. Chodat describes an appearance of green snow 

 caused by a new species of alga, Raphidium Vireti (Ankistrodesmus 



* Midland Naturalist, i. (1909) pp. 82-84. See also Bot. Gaz., xlix. (1910) p. 79. 



t Bull. Soc. Bot. Geneve, se'r. 2, i. (1909; pp. 199-203. 



J Lotos, lvi. (1909) 7 pp. (2 figs, in text). 



§ Ber. Deutsch. Bot. Gesell., xxvii. (1909) pp. 555-62 (1 pi.). 



|| Bull. Soc. Bot. Geneve, se'r. 2, i. (1909) pp. 357-8 (figs.). 



i Tom. cit., pp. 294-97 (figs, in text). 



p 2 



