100 REVUE BRYOLOGTQLE 



pothechim Milt. (216 spec.)^ Fncalypta Schreb. (AO spec), Endo- 

 trichcUa C. M. (13 spec), Entodon C. M. (iil spec) 



11. N. Dlxo^^ — The SludcnVs IlandhooK of brilhh Mosses, with 

 Illustrations, and Keys to the Genera and Species by IL G. Jameson. 

 Second edition, revised and en larged, un vol. in-8de XLIX,386p, 

 et 63 pi. lilhographiees, 1904. Prix net : 18 s. G d. (22 fr. 25).^ 



Celte nouvelle edition est revne et augmentee d'un certain 

 nombre d'cspeces figurees dans 3 planches ajoutees h la premiere 

 edition. Certains genres ou sections ont subi une revision trcs 

 importante : Sphagnum, Systegium, Pottia, Ilypnum llarpidium, 

 De meme que dans la premiere edition on y trouve nne introduc- 

 tion sur la structure des mousses et leur classification, nn dic- 

 , tionnaire dqs termes employes etdes clefs analytiques des genres 

 et des especes. Les descriptions sont suivies de notes tres utiles. 

 Pour que Ton puisse apprecier la valeur de cette excellente (lore 

 je copie la description d'unc espece (it j on a qui sont beauconp 

 plus tongues) : 



1. Plagjotuecilm dephesslm Dixon [Hupnum drpressiim Bruch ; 

 Rhifnchosteghnn depressvm B. et S,, Scbp. Syn. ; Isoplenjfjiiim de- 

 pressum Mitt., Braillnv. Br. M. 11.) — Tab. LV. C. 



In smooth, shining, close tufts of a bright or golden green ; 

 branches slendor, procumhinily almost simide, short. Leaves not 

 derMirrent, suh-dislichotis, somewhat depressed on each side of the 

 branches in two regular rows, or nearly compJanale; not crowded, 

 hardly altered when dry, erecto-patent, oval-obtong, acvte or 

 shortly acuminate, concave, faintly (more mvdy slrouii;\y) denticu- 

 late in the upper half; nerve very short and double, or none ; 

 cells linear-rhomboid, tapering at ends, 6-10-times as longasbroad, 

 very chlorophyllose; laxer and more pellucid at bn^^Q, the angular 

 hardly distinct from the other basal cells. Seta short ; capsule oblong, 

 lid longly and finely acuminate. Dioicous. 



Hab. Foot of trees and shaded rocks incalcareons districts ; not com- 

 mon, Fr. very rare, winter. 



Much resembling Eurh, confertum and other mosses in general 

 aspect, form of leaf, etc., Ibis species may be known from all the 

 species o\ Eurhynchiam by its nerveless or shortly two-nerved leaves, 

 and also by its smooth flat tufts with nearly complanate parellel 

 branches ; from Tlag, elegans, which somewhat resembles it, it is 

 known Ly the less pointed leaves wider areolalion; Plag, deniiculatum 

 has almost always larger leaves, with larger cells, and the leaves are 

 decurrent and have the margin recurved towards base. SematophyUum 

 demissvm has quite dilferent ai eolation, especially at the base, and is 

 autoicous ; and the habit is quite distinct. 



The cells in P. depressum are faintly and minutely papillose, each 



s 



