ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 405 



to Horrell's European SphagnaceaB, where fuller descriptions were given. 

 But the field covered by the synopsis is much wider, and the classifica- 

 tion more elaborate. Further!^ a few new British forms not included 

 in Warnstorf's " Sphagnologia" have been discovered ; and some of these 

 are now described. The work has been prepared in the interests of 

 the Moss Exchange Club. 



British Mosses.* — ^V. Ingham publishes the twenty-second annual 

 report of the Moss Exchange Club, giving the customary list of mosses 

 and hepatics contributed by the members. Valuable remarks and criti- 

 cisms are appended by the referees to some of the items with i-eference 

 to their structural or morphological peculiarities. 



Spanish Bryophytes.f — B. Liizaro e Ibiza has pubHshed in his flora 

 a descriptive account of the genera and species of hepatics and mosses 

 found in Spain — 1)4 hepatics and 328 mosses. In the scarcity of other 

 literature on the subject, the present work should be borne in mind. 

 Its value is enhanced by the inclusion of a number of text-figures. 



Thallophyta. 



Algae. 

 (By Mrs. Ethel S. Gepp.) 



Chlamydomonas.l — Y. Kuwada, in discussing some peculiarities 

 observed in the culture of a marine species of ChJamydomonas, gives an 

 account of the structure of the plant, its cell-division and swarm-spores, 

 and demonstrates that the cell-wall is of the nature of pectin and not 

 cellulose nor callose. 



Structure of Pediastrum.S — R, A. Harper discusses the value of 

 specific types in the well-marked algal genus Pediastrum. Very diverse 

 opinions, reviewed in Nitardy's summary,|| have been held as to the 

 number of species to be recognized, owing to the variation in cell pro- 

 portions, number and arrangements in the colonies. Harper's study of 

 Pediastrum is based on measurements of angles, arcs, etc., made on 

 photo-micrographic enlargements of the eight- and sixteen-celled colonies 

 of P. Boryanum. A table of the mathematical results obtained is given 

 on pp. 98, 99, showing the measurements of the interior angles and of 

 the side- walls of the cells in the sixteen-celled colony. It may be 

 possible to fix upon types which present average measurements. The 

 author proposes to publish a further paper on the method of develop- 

 ment, and especially the variations in type of both cells and colonies as 

 found in the entire genus. 



* York : Coultas and Volans, Ltd., 1917, pp. 177-99. 



t Compendio de la Flora Espauola. Sladrid : Hernando (1906), i. ed. 2, pp. 

 48S-554 ^figs.). 



X Tokvo Bot. Mag., xxx. (1916) pp. 347-58 (1 pi.). 



§ Mem. New York Bot. Gard., vi. (1916) pp. 91-104 (figs.). 



Il Beih. Bot. Centralbl., xxxii. 2 (1911), p. 111. 



