ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 539 



papillosum ; and S. ludovicianum, S. perichaetiaU, and ;S'. guadalupense 

 are identical with ^S'. erythrocalyx. 



North American Hepaticse.*— A. W. Evans pnblishes a third chapter 

 of notes on North American hepaticse, comprising ten species, with some 

 critical remarks on their microscopical characters. They are PalJavicinia 

 hibeniica, Nardia geosajphus, Sphenolohus scitulus, Gephalozia Francisci, 

 Scapania portoricensis, Cololejeiuwa CamilU, Lejeunea spiniloM, Micro- 

 Ujeuma Ruthii, BracMohjeunea densifolia, Ptychocoleus torulosus. Four 

 of the Lejeuneffi are tropical species. 



Hepaticse of Puerto Rico.f — A. W. Evans, continuing his studies of 

 the hepatic^ of Puerto Rico, gives an account of Diplasiohjeunea, a 

 genus remarkable for possessing an underleaf to every lateral leaf, instead 

 of one to every pair of lateral leaves. The same feature occurs in Golura, 

 and Goebel advanced the theory that the leaves are not arranged in a 

 three-ranked spiral, and that after each lateral segment is cut off the 

 apical cell, a postical segment is also cut off. Evans describes in detail 

 the microscopic structure of the genus and the specific characters. He 

 admits four species as native to Puerto Rico, and of these a species and 

 a variety are new to science. He devotes a chapter to the vegetative 

 reproduction and to the structure of the discoid gemmte. 



East African MuscinesB.:]: — B. Schroder gives a list of the hepaticaj 

 and mosses collected during the short expedition of H. Winkler and 

 C. Zimmer to East Africa in" the summer of 1910. They were gathered 

 in East Usambara and on Mount Kilimanjaro. There are 16 hepa- 

 ticaj, 5 of which are new ; and 4i> mosses, 10 of which are new. The 

 former were determined by F. Stephani, the latter by V. F. Brotherus. 

 The microscopical characters of the new species are described. 



Thallopliyta. 

 Algee. 



(By Mrs. E. S. Gepp.) 



Oscillaria and Spirulina.§— S. M. Wislouch gives an account of a 

 water-bloom caused by Oscillaria Agardhii Gom., associated with a new 

 species of Spindina, S. flavovirens, covering the bottom of a small pond 

 in the district of Pskow. It developed in June, had a crawling move- 

 ment, and in August took the form of plankton, the Oscillaria being in 

 enormous quantity. And in the scum which rose to the surface was an 

 unrecognizable purple sulphur-bacterium. 



Zoospores of Chlamydomonas. |1 — P. Desroches discusses the influ- 

 ence of temperature upon tlie zoospores of Chlamydomonas. The rapidity 



* Bryologist, xv. (1912) pp. 54-63 (1 pi.). 



t Bull. Torrey Bot. Club, xxxix. (1912) pp. 209-25 (2 pis. and figs.). 



X Hedwigia, lii. (1912) pp. 304-15. 



§ Bull. Jard. Imp. Bot. St. P^tersbourg, xi. pp. 155-61 (figs.). 



II Comptes Rendus, cliv. (1912) pp. 1245-47. 



2 2 



