ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 431 



Bryophyta. 



Biology of Hepaticae.* — F. Cavers publishes a contribution to the 

 biology of the four thalloid genera, Targionia, Reboulia, Preissia, 

 Monoclm, which he has had under cultivation for the past three years, 

 and brings out several points which have been overlooked or left obscure 

 by previous writers. He describes for each of the genera the external 

 features of the thallus, the epidermis, air-chambers, pores, ventral 

 scales, rhizoids, the antheridia and archegonia with their receptacles, the 

 sporogonium, capsule, spores and elaters, accompanying his account with 

 several illustrations. Monoclm was obtained from a nursery garden in 

 York, and the details of its morphology and biology are the most com- 

 plete that have yet been published. 



Hepaticae of Atlantic type in Scotland/) - — S. M. Macvicar discusses 

 the distribution of the Atlantic species of hepaticae in Scotland, that is 

 of certain species which are characteristic of the west coast of Europe and 

 the Atlantic islands, a few of them occurring along the Mediterranean 

 and in America. Having referred to the importance of moisture, 

 •equable temperature and condition of the soil, and having shown that 

 the main watershed of Scotland is not of much importance in the distri- 

 bution of these plants, the author divides the Atlantic species into groups, 

 showing that sixteen occur only on the western watershed ; two occur 

 only on the east coast, but not inland ; five cross a little way over into 

 the eastern watershed ; seven, common in the west, cross over to the 

 east, but are rare ; seven, of Alpine type, are common to the western 

 watershed and the eastern Grampians. Further, ten Scottish species are 

 not found in England ; six not found in Ireland ; one English and eight 

 Irish species are absent from Scotland. All the Atlantic species are found 

 in the British Isles, but thirteen British species are absent from the east of 

 Europe, and these are of tropical affinity ; seven are common to Norway 

 and France ; eleven occur in Norway but not in France ; and seven in 

 France but not in Norway. The origin of the Atlantic species in our 

 ■country cannot be traced to any known geological period. 



Plagiothecium piliferum.^ — L\ A. Jones adds to the British moss- 

 fiora Plagiothecium piliferum, gathered in fruiting state by Duncan on 

 Ben Lawers in Aug. 1902, and gives its synonymy and a translation of 

 Schimper's description of the species. Only one tuft of the plant was 

 found. It grows on granite mountains in the north and south of 

 Europe. 



Hepaticae of Puerto Rico.§ — A. "W. Evans gives a detailed account 

 of the genera Odontolejeunea, Gyclolejeunea, and Prionolejeunea. The first 

 of these is represented by two species in Puerto Rico, the second by four, 

 and the third by five, four of which are new. The genus Cydolejeunea is 

 new, and is separated from Odontolejeunea, from which it differs in its 

 leaves and underleaves, and in its vegetative reproduction by means of 



* Leeds, 1904, 8vo, 47 pp., 12 figs. 



+ Ann. Scot. Nat. Hist.. 1904, pp. 119-25. 



\ Journ. of Bot., xlii. (1904) pp. 156-7. 



§ Bull. Torrey Bot. Club, xxxi. (1901) pp. 183-22G (5 pis.). 



