— 29 — 



peres and Syrrhopodon, with illustrations of the cross-sections of the leaves. 

 This article is an advance notice of the results obtained from the studies for 

 the forthcoming parts of the North American Flora. Nineteen species of Syrr- 

 hopodon are recognized (5. graminicola being new and S. filigerus (Aust.) Wil- 

 liams a new combination) of" which SS. floridanus, texanus, ligulatus, and fili- 

 gerus are recorded from the United States. Twelve species are credited to 

 Calymperes (C. cuhense, C. Nashii, C. fl,uviatile proposed as new) of which CC. 

 Richardi, emersum, Donnellii, and Nashii occur in the United States. 



Monsieur J. Amann has recently published a second list^ of additions and 

 corrections to his Flore des Mousses de la Suisse, recently reviewed in The 

 Bryologist.^ Much of the material naturally related to matters of wholly 

 local interest, and results from a continuation of intensive study. To our mind 

 a number of the varieties proposed as new are of distinctly minor importance, 

 the distinguishing characters being too closely dependent upon habitat. While 

 the study of such variations is preeminently worth while, and their mention 

 and description an important task in an intensive catalogue, it seems hardly 

 worth while to add to the growing number of moss names by giving them dis- 

 tinctive appellations. We would not imply, however, that these plants are not 

 interesting; many of the little remarks and notes included in the article are of 

 the greatest interest, and should serve to spur all field students to closer obser- 

 vation; it is just such things that make moss-study worth while. The following 

 species are proposed as new (we do not list the many new varietal names) : Bar- 

 hula poenina, Syntrichia gelida, Bryum appendiculatum, B. Britanniae, Mnium 

 amUystegium, all figured; in addition the original descriptions of Ptychodium 

 albidum Amann and P. pallescens Amann are much amplified from the study 

 of new material. Interesting also are the observations bearing upon the prob- 

 able hybridity of Grimmia Cardoti Her. and the occurrence of an i8-toothed 

 peristome in Orthotrichum speciosum Nees. The portions of the article of most 

 interest to American readers are probably these dealing with the size of the 

 median leaf cells in Mnium. For each Swiss species the author gives a numerical 

 statement showing the number of cells per linear millimeter for the median 

 leaf region, both extreme and mean numbers being given; there are two or three 

 pages of fine print discussing the results, which seem to afford a basis for a more 

 accurate determination of sterile material. The comparisons between Mn. 

 orthorrhynchum and Mn. lycopodioides are particularly detailed, and should be 

 carefully checked upon extra-European material, as, we understand, M. Amann 

 is endeavoring to do. M. Amann devotes nearly three pages also to a synoptic 

 view of the European species of Hygroamblystegium Loeske. In spite of M. 

 Amann's statement that he has studied "un specimen authentique de I'H. 

 noterophilum (Buffalo, U. S. A., leg. Clinton)," and that it shows the species 



6 Amann, J. Nouvelles additions et rectifications a la Flora des Mousses de la Suisse. Bull. '* 

 Soc. Vaudoise des Sci. Nat. 53: 81-125. text figs. 1-18. 1920. 

 Bryologist 33: 41-43. 19 19. 



