398 SUMMARY OF CURRENT RESEARCHES RELATING 10 



strongly staining cells have the capacity of emitting regeneration-shoots ; 

 the staining is not due to tannin, but to store-material connected with 

 regeneration-capacity ; but this store-material is capable of being trans- 

 ferred to any other living cell. 



Peristome in Ceratodon purpureas.* — A. W. Evans and H. D. 

 Hooker give an account of the development of the peristome in 

 Ceratodon purpureus, a member of the Haplolepidese. The original 

 amphithecium, eight cells in transverse section, divides by periclinal 

 walls into an inner and an outer layer. From the inner amphithecial 

 layer is developed the inner peristomial layer, consisting of twenty-four 

 longitudinal rows of cells. From the outer amphithecial layer is cut 

 off the outer peristomial layer, sixteen longitudinal rows of cells. Ridges 

 of thickening, representing the future teeth, are laid down upon the 

 periclinal walls between the two peristomial layers. There are then 

 eight groups of cells or cell-rows of the peristomial layers, each com- 

 posed of two from the outer layer and three from the inner layer, and 

 each group gives rise to two teeth. In the upper part of each group 

 four strands of thickening are laid down, representing the two slender 

 branches of each tooth of the pair ; in the lower part of the group only 

 two such strands are formed. Thickenings of transverse walls and of 

 certain radial walls become respectively the transverse ridges and the 

 inner median longitudinal line of the teeth. 



Riella Reuteri.f — L. Trabut, in writing of the presence of two 

 species of Riella in Tunis— J?. helicophylla and R. Reuteri, discusses all 

 the Mediterranean species of the genus, and comes to the conclusion 

 that R. Retiteri is a variable species ; that the type from Greneva is a 

 reduced form with spores measuring 50-55 fx ; that R. Battandieri, from 

 Algeria and Tunis, is a form of it, almost as much reduced, but with 

 larger spores, 60-65 /x : that R. gallica, from Roquehaute and Agde in 

 the south of France, is a robust form of it, with its vegetative period 

 prolonged in summer by propagula, and with spores 75-80 ft. Photo- 

 graphs of stages of R. Battandieri and R. gallica are given. 



Bohemian Sphagnacese.J — K. Kavina publishes a monograph of 

 the Sphagnace^ of Bohemia, comprising an historical account, mor- 

 phology, anatomy, biology, phytogeography, classification, with descrip- 

 tions, synonymy, literature and exsiccata-references, figures, etc., and a 

 bibliography. The text is Bohemian. 



Japanese Saline Moss.§ — E. B. Chamberlain gives a translation of 

 a paper by S. Okamura on a new Japanese moss, Dicranella salsugiiiosay 

 which grows on the seashore near Yusaki in the province of Wakayama, 

 and, as analysis shows, absorbs a considerable proportion of salt from 

 the spray. The structure of the plant is described, and a suggestion is 

 made that a chemical comparison should be made with Grimmia 

 maritima. 



* Bull. Torrey Bot. Club, xl. (1913) pp. 97-109 (figs.). 



t Bull. Soc. Bot. France, Iviii. (1911) pp. 171-4 1 pi.). 



X SB. k. bohm.Ges. Wiss., 1912, No. 11 (Prag. 1913) 219 pp. (2 pis. and figs.). 



§ Bryologist, xvi. (1918) pp. 46-7. 



