No. 2, March, 1921 J MORPHOLOGY AI>fD TAXONOMY, BRYOPHYTES 



163 



this conclusion the reviewer emphasizes the danger of regarding two similar plants as distinct 

 species merclj' because they occur in widely separated regions and are absent from inter- 

 vening areas. He shows how it is possible for a species to have a discontinuous distribution 

 of this type and advises that each case be decided on its own merits after careful study of 

 all available data.— A. W. Evans. 



1084. Fleischer, M. [Rev. of: Timm, R. Neue wichtige Moosfunde aus dem nordwest- 

 lichen Deutschland. (Important new discoveries of mosses in northwestern Germany.) 

 Allg. Bot. Zeitschr. 1916: 17-27. 1916.] Hedwigia 60: (Beiblatt) 38. 1918.— The reviewer 

 expresses the opinion that certain species of Drepanocladus and Slereodon, listed by the author, 

 represent forms or varieties rather than true species.—^. W. Evans. 



1085. Fleischer, M. [Rev. of: Kern, F. Beitrage zur Moosflora der Bayrischen Alpen. 

 (Notes on the moss flora of the Bavarian Alps.) Jahresber. Schles. Ges. Vaterl. Kultur. 1917: 

 1-6. 1917.] Hedwigia 60: (Beiblatt) 127-128. 1918.— The reviewer comments on the 

 nomenclature of a few of the mosses listed by the author.— .4. W. Evans. 



1086. H[iERONYMUs], G. [Rev. of: Van den Broeck, H. Les muscinees de I'Herbier 

 beige du Jardin botanique de I'Etat Sl Bruxelles. (Bryophytes of the Belgian herbarium of 

 the National Botanical Garden at Brussels.) Bull. Jard. Bot. Bruxelles 4:243-303. 1914.] 

 Hedwigia 60: (Beiblatt) 129. 1918.— The reviewer emphasizes the importance of this con- 

 tribution to the bryophytic flora of Belgium.— il. W. Evans. 



1087. Fleischer, M. Die Moosvegetation im Urwald von Bialowies. [The moss vege- 

 tation in the primitive forest of Bialowies.] .Bot. Jahrb. 55 (Beiheft) : 113-124. 1919.— See 

 Bot. Absts. 6, Entry 1506. 



1088. Haynes, Caroline C. Illustrations of six species of Riccia, with the original descrip- 

 ■ tions. Bull. Torrey Bot. Club 47: 279-287. PL 10-13. 1920.— Descriptions and figures are 



given of the following North American species of Riccia: R. Donnellii Aust., R. dictyospora 

 M. A. Howe, 7?. Beyrichiana Hampe, R. nrvensis Aust., R. hirta Aust., R. Curtisii James.— 

 P. .4. Mvnz. 



1089. LoRCH, W. Die Torsionen der Laubmooseta. [Torsions in the setae of mosses.] 

 Hedwigia 61 : 40-91. 1919.— See Bot. Absts. 6, Entry 1351. 



1090. Pearson, W. H. Diplophyllum taxifolium in Westmoreland. Naturalist 1918: 234. 

 1918.— The discovery of Diplophyllum taxifolium on Hart Crag, Westmoreland, England, by 

 L. J. Cocks, is reported. The species is new to the county of Westmoreland.— IF. H. Pearson . 



1091. RiCKETT, H. W. Regeneration in Sphaerocarpos Donnellii. Bull. Torrey Bot. Club 

 47: .347-357. Fig. 1-25. 1920.— Regeneration, or the production of adventitious shoots from 

 vegetative tissue, was observed in Sphaerocarpos Donnellii either when the thallus as whole was 

 partly dead, or when portions of it were separated partly or wholly from the rest. In gen- 

 eral regeneration originates from a single cell, with a tendency in early stages toward a forma- 

 tion of a two-sided apical cell. A typical thallus develops from the first cell-mass in a way 

 analogous to the development of a mature thallus from the tube formed by a germinating 

 spore. — P. A. Munz. 



1092. RxjBNER, K. [Rev. of: Grebe, C. Studien zur Biologic und Geographie der Laub- 

 moose. I. Biologie und Okologie der Laubmoose. (Studies on the biology and geography of 

 mosses. I. Biology and ecology of mosses.) Hedwigia 59: 1-208. 1917.] Forstwiss. Cen- 

 tralbl. 41 : 431-433. 1919.— See Bot. Absts. 6, Entry 610. 



1093. Theriot. I. Contribution a la flore bryologique de Madagascar. [Contribution to 

 Madagascan mosses.] Recueil Publ. Soc. Havraise Etudes Diverses 87: 95-111. PI. 1. 2. 

 1920.— The paper gives a list of 66 species of mosses and 8 of hepatics, the latter without 



