332 SUMMARY OF CURRENT RESEARCHES RELATING TO 



muraria in the length of its stipes, in the green upper part of rachis, 

 the distant pinnae, and the tripartite lower pinnae. It was found at 

 Proctor, Vermont, U.S.A., by Gr. A. Woolson, who, suspecting the 

 anomalous plant to be a cross between the above species, made a most 

 careful search for the parent species. A. Ruta-muraria grew abundantly 

 close by, but A. Trichomanes could be found no nearer than 1*25 ft. from 

 the hybrid. No plant of A. viride could be found at all. Similar 

 hybrids in Europe have been described by Christ and others. Davenport 

 discusses the capacity of the wind for mingling spores brought from a 

 distance. M. Goldschmidt* has drawn up a key for the determination 

 of the hybrids and forms of Athyrium filix-femina Roth., growing wild 

 in middle Europe. The key is founded on external and obvious charac- 

 ters, and is worked dichotomously ; it comprises 48 forms. Appended 

 is a bibliography of 22 works. 



Ch bis ten sen, C. — Index Filicum. (Index of Ferns.) 



[Continuation. Leptochilus dccurrcns — Polypodium Beccarianum.~\ 



Copenhagen: Hagerup, 1906, fasc. 7, 8, pp. 385-512. 



Muscinese. 

 (By A. Gepp.) 



Notes on British Mosses. — W. E. Nicholson t describes an interesting 

 hybrid between Weisia crispa Mitt., female plant and W. microstoma 

 CM., male plant. He found it in a rough stony field on the chalk 

 downs near Lewes, where the capsules mature towards the end of March. 

 A full description of this hybrid is given. No trace was found of 

 reciprocal hybridity. J. A. Wheldon and A. Wilson $ enumerate 23 

 mosses and 12 hepatics among their additions to the flora of West 

 Lancashire, and mark 12 of them as new records for the county. Lopho- 

 colea bidentata var. rividaris Raddi, is a new record for Britain, and a 

 description of this variety by Warnstorf is inserted. 



Notes on European Mosses.§ — N. C. Kindberg adds to the informa- 

 tion already existing about Grimmia sardoa De Not. It differs from 

 67. trichophyUa in having smaller leaves, shortly acuminate, often arcuate 

 when moist. The cells are smaller, almost all very sinuous, the alar 

 cells shortly rectangular. In 67. Lisa, the leaf-cells are wider (as in 

 67. trichophyUa), less or but little sinuous, and the hairs denticulate. 

 The second note records Pleuroweisia SchliephacJcei Limpr., from Tyrol. 

 It is very rare, having been found previously only in the east of Switzer- 

 land and in the Caucasus. When sterile it is easily confounded with 

 Weisia calcarea, but is distinguished by its inflorescence, and the leaf- 

 margins are often reflexed. 



Antarctic Mosses.|| — J. Cardot has examined the moss collections 

 brought home by the ' Belgica ' Expedition, the Swedish Expedition, the 



• Hedwigia, xlv. (1906) pp. 119-23. 

 t Rev. Bryolog., xxxiii. (1906) pp. 1-2. 

 t Journ. of Bot., xliv. (1906) pp. 99-102. 

 § Rev. Bryolog., xxxiii. (1906) pp. 30-1. 

 || Comptes Rendus, cxlii. (1906) pp. 456-8. 



