340 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Mosses of Hampshire and Isle of Wight.* — A. B. Jackson pub- 

 lishes a moss-flora of Hampshire and the Isle of Wight, containing 220 

 species and several varieties. It is based partly on the earlier published 

 records of Venables, C. B. Clarke, H. Reeks, F. T. Warner, H. N. 

 Dixon, and sundry manuscript lists. 



Notes on the Harpidia.f — W. Ingham gives the results of his 

 observations of the Harpidia in their natural habitats in the Plain of 

 Yorkshire, and of the changes which they undergo as their environment 

 alters from wetness to dryness, etc., during successive seasons and years. 

 He states his conclusions as to the passing of one form into another as 

 the deep water of a pool drains or evaporates away or completely dries 

 up. His observations are directed to Hypnum aduncum, H.fluitans, 

 and H. lycopodioides. 



European Forms of Catharinea.J — W. Krieger gives the results of 

 his further studies of the European species of Catharinea. He main- 

 tains that C. unduJata is not a series of separable forms, but a group of 

 variations which pass directly into one another. Almost every visible 

 part of the plant is variable. While C. Hausknechtii is a good species, 

 G. pallida Peterfi must be reduced, being synonymous with G. undulata 

 var. chlorocarpa. The author provides a key to the forms of C. undulata 

 and the few other European species, and concludes with notes on special 

 forms, adding a reference to two new forms of Polytrichaceas of which 

 he has become possessed. 



Systematic Position of Mnium riparium.§ — R. Sebille recalls the 

 dispute between H. Muller and W. P. Schimper forty-five years ago 

 about the moss now known as Mnium riparium Mitt. (1864), which is 

 distinguished from 31. serratum by the inflorescence only. 31. riparium 

 is strictly dioicous, whilst 31. serratum is synoicous, but sometimes bears 

 flowers which are solely female. Muller at first designated 31. riparium 

 as 31. serratum var. dioicum, but after a controversy with Schimper he 

 was constrained, against his own conviction, to regard the plant as a 

 separate species. Sebille now, after a study of numerous specimens of 

 31. serratum confirming its marked tendency to separate its sexes, is 

 inclined to regard 31. riparium as a dioicous form of the synoicous but 

 variable 31. serratum, especially in view of the broader modern views 

 as to the liability of the nature of the inflorescence to vary under the 

 influence of climate or of the chemical constitution of the soil. He 

 comes to the conclusion that 31. serratum is an Alpine species growing 

 in rich humus, and that its dioicous variety, 31. riparium, is a lowland 

 race proper to poor alluvial soil. It had previously been recorded from 

 Germany, North Italy, Britain, and Scandinavia. And now France is 

 added to its distribution. 



Swiss Mosses. || — P. Culmann describes and figures Bryum sagittal- 

 folium, found associated with Philonotis tomentella at an altitude of 



* Papers and Proc. Hampshire Field Club (1907) 12 pp. (reprint). 



t Rev. Brvolog., xxxv. (1908) pp. 35-8. 



\ Hedwigia, xlvii. (1908) pp. 200-3. 



§ Rev. Bryolog., xxxv. (1908) pp. 12-13. || Tom. cit., pp. 17-28 (fig.). 



