ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 599 



it as a new genus, resembling Acrobolbus Wilsoni in its leafy shoots and 

 Jeaf -shape, but distinguished by the ventral abbreviated male and female 

 branchlets. 



W. Wollny * describes and figures Sphenolobus Jiliformis, a new 

 species of hepatics from the Kitzbuhel Alps of Tyrol. It is very like 

 Cephalozia in habit. 



Fruiting State of Campylopus polytrichoides.j — G. Dismier 

 announces the discovery of Campylopus polytrichoides in a fruiting state 

 in France. In 1881 it was recorded for Portugal, in 1006 for Spain, 

 and a fruiting Portuguese specimen has since been found in the 

 Paris Museum. Last December Dismier found it in France, growing 

 abundantly in the western Pyrenees at Saint Etienne de Baigorry. 

 He gives a description of the sporogonium, and sketches out the area 

 of distribution of the species, a silicicolous plant, limited to the western 

 .and southern regions of Europe, north Africa, the Atlantic Islands, 

 Madagascar, the United States, and Brazil. 



Teratology in Pogonatum.J — E. Balle describes an instance of 

 teratology presented by a plant of Pogonatum aloides, found at Vire 

 (Calvados). It bore a divided leaf with normal nerves and denticula- 

 tions. Descriptions and measurements are given. 



Cohesion-mechanism of Moss-leaves.§ — C. Steinbrinck continues 

 the discussion on the cohesion-mechanism of the leaves of Polytrkhum, 

 and replies to the arguments of W. Lorch, and is in entire disagree- 

 ment with him, denying that there is any cohesion-mechanism of the 

 kind described by Lorch. He thinks the latter attaches a wrong 

 meaning to the word cohesion. 



Thallophyta. 



Algae. 



(By Mrs. E. S. Gepp.) 



British Fresh-water Phytoplankton.|| — W. and G. S. West embody 

 the results of their joint study of British fresh-water plankton in an 

 important paper, adding thereto their views on Desmid plankton in 

 general, and the distribution of British Desmids. After some intro- 

 ductory remarks, they describe shortly the constituents of the Scottish 

 lakes, the lakes of the Orkneys and Shetlands, the Irish lakes, Lough 

 Neagh, the Welsh lake area, the English lake area, Malham Tarn, in 

 West Yorkshire, and the British river plankton ; and then give a tabu- 

 lated list of all the species observed in the phytoplankton of the British 

 Islands, which include 506 species and 118 varieties. Of this total 

 46 p.c. were species of the Desmidiaceaa. 



In a general summary the authors state that the British lakes coin- 



* Hedwigia, xlviii. (1909) pp. 345-6 (pi.). 



t Bull. Soc. Bot. France, lvi. (1909) pp. 273-6. 



\ Rev. Bryolog.,xxxvi. (1909) p. 100. 



§ Ber. Deutsch. Bot. Gesell., xxvii. (1909) pp. 169-76 (figs.). 



|| Proc. Roy. Soc, Series B, lxxxi. (1909) pp. 165-206 (figs.). 



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