"236 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Drepanolejeunea bidens.* — Caroline C. Haynes publishes an account 

 of Drepanolejeunea bidens (Steph.) Evans, a minute hepatic discovered 

 on bark or leaves in Tennessee years ago by A. Ruth, but only recently 

 determined by A. W. Evans. Previously the species was known only 

 from tropical America. A. W. Evans's detailed description of the 

 species is given in full, and figures of the structure are added. The 

 plant is closely related to the British D. hamatifolia, which is also 

 recorded from tropical America. 



Bryological Notes."}" — H. N. Dixon continues his series of notes on 

 bryological difficulties. 1. He shows from Mitten's own writings that 

 Meteorium lanosum Mitt, is conspecific with M. longissimum Doz. 

 & Molk. ; and that ingenuity of the later writers to prove them 

 different in point of structure is wasted. 2. He revises H. Boswell's 

 list of New Zealand bryophytes (1894). 3. Lepidopilum sumatranum 

 V. d. Bosch & Lac. is not distinct from, but identical with Hoolceria 

 utacamundiana Mont. {Lepidopilum Mitt.). 4. The combination Barbida 

 rubella (Hoffm.) is traced to S. 0. Lindberg,| though it has wrongly been 

 ascribed to Mitten. 5. Dicranum dichotomum (Bourbon), D. Billardieri 

 (sub-antarctic), D. commutatum and D. tabidare (Cape of Good Hope), 

 D. scopareolmn and B. patent if oliiim (Madagascar) are proved to be 

 conspecific. 6. A similar clearing up of the synonymy of two Australasian 

 species, Cryphidium ovalifoUum and G. dilatatum, is made. The structural 

 details upon which these notes are based are clearly defined in the 

 original paper. 



Hepatics in West Cornwall. § — W. E. Nicholson publishes a list of 

 some interesting hepatics gathered at the Lizard and Carbis Bay during 

 a brief visit in the spring of 1916. Two of these, Fossombronia 

 Grozalsii and Dichiton calycidatum, had not previously been recorded 

 for this country ; and it may be that the rarity of Dichiton is partly due 

 to the superficial resemblance of the plant to Cephaloziella integerrima, 

 Lophozia excisa, etc. A full description of Dichiton is given ; and 

 critical notes on the structure of some of the other species are supplied. 



Thallophyta. 



Algae. 



(By Mrs. Ethel S. Gepp.) 



August Heleoplankton of some North Worcestershire Pools. || — 

 B. M. Griffiths reports on collections of heleoplankton taken from nine 

 pools in the Kidderminster district. Marked peculiarities are shown in 

 the respective floras. In many cases, also, species either rare or not 

 commonly found in the plankton of large lakes were present. The pools 

 were too small to allow of true plankton being found. A large number 



* Bryologist, xix. (1916) pp. 83-6 (figs.). 



t Journ. Bot., liv. (1916) pp. 352-9. 



i Mus. Scand., 1879, p. 22. 



§ Journ. Bot., Iv. (1917) pp. 10-12. 



II Journ. Linn. Soc, xliii. (1916) pp. 423-32 (2 pis.). 



