Floristik, Geographie, Systematik etc. 283 



forest climatic formation and the northeastern coniferous forest 

 climatic formation are described separately and in both cases 

 considerable attention is given to the röle of bryophytes in the 

 component associations. The deciduous forest climatic formation 

 occupies the lowlands and its climax association type is eharacteri- 

 zed by Fagus grandifolia , Acer saccharum, Betula lutea, Abtes bal- 

 samea, Tsuga canadensis and Pinus strobus. The uplands are occu- 

 pied by the northeastern evergreen coniferous forest climatic 

 formation in which the dominant climax species is Abtes balsamea. 

 The conclusion is reached that the inability of Abtes balsamea to 

 compete successfully with the climax species of the lowlands can 

 be attributed largely to its shorter tenure of life and its greater 

 susceptibility to fungus disease as well as possibly to its less pro- 

 nounced tolerance of shade. 



The important part played by different species of Sphagnum 

 in the development of bogs, especially raised bogs, is discussed and 

 the species of Sphagnum occurring in the region are classified into 

 five groups based on the degree of hj^drophytism. 



W. ß. McDousall. 



*!=>■■ 



Nieuwland, J. A., Critical notes on new and old genera 

 of plants. (Amer. Midi. Nat. V. p. 50—52. Mar. 1917.) 



Contains as new: Thamnobryum {Thamnium Bry. Eur.), with 

 transfer of the species pumilum, lalifolium, " Bilgelovii" , angustifo- 

 liuntj alleghaniense , Leibergii, pseudoneckeroides and microalopecunim; 

 Villanfa (Zonaria Ag.), with transfer of the species flava, lobata and 

 Turneriana\ and Kulmites [Taenidium Heer), with the fossil species 

 K. Fischeri {Taenidium Fischerii Heer). Trelease. 



Ostenfeld, C. H„ A revision of the West Australian spe- 

 cies of Triglochin, Crassula {Tillaea) and Frankenia. Contri- 

 butions to West Australian Botanv. V. (Dansk Bot. Arkiv. 

 II. N° 8. p. 30-55, with illustr. and plate. 1918.) 



A critical revision of the species of the said genera known 

 from West Australia. Seven annual species of Triglochin are 

 accepted as valid ones and figured on the plate. Tillaea is regarded 

 as a subgenus of Crassula, to which genus subsequently all the 

 species, 6 in all, are tranferred: C. pedicellosa (F. v. M.) comb, nov., 

 C. colorata (Nees) comb, nov., C. intricata (Nees) comb. nov. C. Mi- 

 riamaß is described as new. Most of the species are figured. — 15 

 species of Frankenia are accepted and several of them illustrated. 

 New are F. Maidenii, F. interioris with the var. conspicua and F. 

 compacta. A key to the species is given for each genus. 



Carl Christensen. 



Ostenfeld, C. HL, Bemaerkninger om dansk e Traers og 

 Buskes Sjrstematik og udbredelse. I. Vore Aelme- 

 Arter. [Taxonomic and distributional remarks on Da- 

 nish trees and shrubs. I. Our elm-species]. (Dansk Skov- 

 forenings Tidsskr. p. 421—442. 7 Text figs. Copenhagen 1918.) 



A review of danish species of Ulmus. The following species 

 are recorded: U. glabra Huds. (= U. montana With), common; a 

 var. nitida Fr. is very rare. U. vegeta (Loud.) C. K. Sehn.; U. laevis 



