296 SIJMMAKY OF CURRENT RESEARCHES RELATING TO 



merely a waterform of H. commutatimi. Dichodontium flavescens is the 

 waterform of D. pellmidum. Fourteen other species are discussed in 

 connexion with waterforms, certain of which become specially modified 

 morphologically by dripping water, and form so-called " drip-forms." 



E. S. Gepp. 



New British Sphagna. — J. A, Wheldon {Journ. ofBot., l'.>21, 59, 

 185-8, 1 fig.). A critical account with diagnoses of new varieties and 

 forms of Sphagnum detected in Britain. The most interesting of these 

 is S. hercynicnm var Binsteadii, from Cefn Hill in Herefordshire, a 

 variety of a rare and local species only once found in the Harz 

 Mountains. The new British variety also approaches the common 

 S. inundatum, but is separated from it by some very distinct characters. 



A. G. 



Reports on Two Collections of Mosses from British East Africa. — 

 H. N. Dixon {Smithsonian Miscell. Collections, li)20, 72. Xo. ;'>, 

 20 pp., 2 pis.). The first collection, made by the Dummer-Maclennan 

 Expedition to Mount Elgon in 1918, contains nearly fifty specits, ten of 

 which are described as new, including interesting new species of 

 Holomitrium, Bryimi and Braunia. The second is small (eight species), 

 but contains the type of a new genus, Kleioweisiojms, which has the 

 habit of Astomum. A. Gr. 



Bryological Notes.— H. N. Dixon {Journ. ofBot., 1921, 59, 132-9). 

 This seventh chapter of the author's Uiscetkmea Bryologica contains 

 critical notes on, inter alia, the misunderstood Hypnum repUcatmn 

 Hampe, which really is a Semaiophyllum of quite unusual habit. 

 Hypnum limatum Hook. f. & AVils. and H. australe C. Miill. from 

 Campbell Island are synonyms, and must be referred to Isotheciuni and 

 not to Ectropotheciam. A remarkable species of SchivetscliJcea from East 

 Africa has highly papillose leaves. Hypnum lithophyllum Hook. f. & 

 Wils. from Hermite Island is synonymous with H. secundifolium 

 C. Miill., and is certainly not a Rhaphidostegium, but should be placed 

 in the genus Drepanodadus. Porotrichum elegantissimum IMitt. from 

 Samoa is shown to be identical with P. kuhliana of the Bryologia 

 Javanica, and both have been placed in the genus Pinnatella by 

 Fleischer. A. Gr. 



Distribution of Mosses in Sweden. V. Polytrichacese : Part I.— 

 Hjalmar Moller {Arhiv for Botanik., 1921. 16, No. 8, 84 pp., 2 pis.). 

 This part deals with the genera Catharinseu, Psilopilum, OUgotrichum, 

 Pogonatum. It is written in Swedish, and discusses the synonymy, 

 ecology and local distribution of each species and variety, including 

 critical notes, and, where necessary, a description. Valuable figures of 

 the lamella3 are given in plate 2, showing them as they appear when 

 detached from the leaf. A. G. 



Thallophyta. 



Aigee. 



Phytoplankton of some Norwegian Lakes. — K. M. Str0m {Viden- 

 skap. Shift. I. Mat.-Nat. KL, 1921, No. 4, 51 pp. 3 pis.). The 



