ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 597 



Pleurozygodon sibiricum a Molendoa.* — I. Gyorffy writes a sliort 

 note to point out that Pleurozygodon sibiricum Arnell is in reality a form 

 of Molendoa Sendtneriana, and corresponds with a new form, f. dura, 

 which (iyorffy is about to publish in his forthcoming monograph of the 

 Molendoae. To establish priority he here publishes the identity, refer- 

 ring to Arnell's full diagnosis of M. Sendtneriana, and promising further 

 details later. His reasons for claiming the species as a Molendoa are as 

 follows : — 1. Many female inflorescences occur along the stem and not 

 at the apex only. 2. The leaves are 'those of a Molendoa and correspond 

 with the author's f . dura. They are remarkably close and much smaller 

 than in other known forms. 3. Leaf cells elongated in the lower portion 

 along the nerve, 3-4-angled in the middle and broader rather than long, 

 and except in the lower portion covered with weak papilla?. 4. Apex 

 formed by the midrib. 5. Structure of the midrib is that of M. Sendt- 

 neriana. 6. Transverse section of stem is a rounded triangle with 

 central strand ; epidermis 1-2 rows of cells. 



Forms of Leucobryum glaucum.t— L. Ljubitzkaja publishes a 

 detailed account of the forms of Leucobryum glaucum. He maintains 

 that in Europe we have but this one species of the genus. L. albidum 

 is but a variety of it. In the Caucasus and in Italy occurs a new variety 

 here described under the name of gracile. The author discusses the free 

 flattened balls or disks of L. glaucum which occur in Britain, and have 

 been described by Burrell and Williams ; he has found them also in the 

 Russian province of Minsk, leading a similar detached life ; and he calls 

 them var. subsecundum. In Western Russia L. glaucum is abundant 

 but sterile ; rare in central Russia, and absent further east ; but it is 

 abundant and fertile in the Caucasus — var. gracile. 



Microscopical Methods in Bryological Work.} — G. T. Harris 

 publishes some instructions as to the best methods of preparing a 

 permanent series of mounted slides of mosses for microscopical study of 

 their structure, with suggestions as to the selection and treatment of the 

 parts of the plant which should be mounted, and hints for the avoidance 

 of difficulties and failures in the preparation and preservation of the 

 mounts. In the light of years of experience, he discusses the most 

 suitable mounting media, cements, etc. 



New Mosses from West Ross-shire.§— J. Stirton describes some 

 new mosses from Duncraig in AVest Ross-shire. Limneria viridula is a 

 new genus and species which shows some affinity with both Rhacomitrium 

 and Campylostelium. Brgum intortulum and Campylopus obtectus are 

 barren species previously unknown. Leptodontium Rossii is also a barren 

 new species. Four other species of Leptodontium occur in the same 

 neighbourhood, one of which — L. terrenum — was described by him in 

 1900. And only one of them— L. flexifolium — is known in tlie fertile 



* Arkiv f. Botanik, xiv. No. 1 (1915) 3 pp. (1 pi). 



t Bull. Jard. Imper. Bot. Petrograd, xiv. (1914) pp. 351-419 (figs, and map). 

 See also Bot. Centralbl., cxxix. (1915) p. 230. 



% Journ. Quckett Micr. Club, xii. (1915) pp. 521-36. 



§ Trans. Proc. Bot. Soc. Edinburgh, xxvi. pt. 4 (1915) pp. 423-9. 



