Bryophyten. — Pteridophyten. 
359 
Barker, T„ W. Ingham, and others. A Census Catalogue of 
British Mosses, with list of the Botanical Vice Counties 
and their boundaries, and lists of sources of records, 
compiled under the direction of the Moss Exchange Club, 
showing the comparative rarity or frequency of each spe- 
cies and variety by means of a Census, indicating its 
distribution through the 112 Watsonian Vice County Di- 
visions of Great Britain, and R. Lloyd Praeger’s 40 County 
Divisions of Ireland. (York: Coultas and Volans. 1907. 63 pp.) 
This catalogue is the result of the combined effort of the Moss 
Exchange Club to record the distribution of the 619 species of Bri¬ 
tish Mosses in their native country. The System of Classification fol- 
lowed is that of Dixon’s Student’s Handbook of British Mosses 
(Edition II). Though admitted by the compilars to be incomplete the 
catalogue is an immense advance upon all its predecessors. Expla- 
natory notes are supplied by Mr. W. Ingham and Mr. H. N. Dixon. 
The bibliography forms a valuable and almost exhaustive record of 
the very scattered papers on British Mosses and includes also refe- 
rences to many manuscript lists. A. Gepp. 
Christensen, C., Revision of the American Species of Dry- 
opteris of the Group of D. opposita. (Köbenhavn, Kgl. Danske 
Vidensk. Selsk. Skr., 7. Rekke, naturvid. Afd., IV. 4, 1907, p. 247— 
336 with 52 figs. in the text.) 
Based upon the materials preserved in the herbaria of Berlin, 
Copenhagen, Stockholm, and in the private herbaria of H. Christ 
(Basel) and E. Rosenstock (Gotha), the author has revised the 
American species related to Dryopteris opposita (Vahl) Urban. 
He gives the following diagnosis of the group: “Species Dryopte- 
ridis lamina bipinnatifida ad basin attenuata, pinnis sessilibus, venis 
liberis, simplicibus vel raro furcatis, basalibus supra sinum margi- 
nem attingentibus, soris rotundis vel raro elongatis, exindusiatis vel 
indusio parvo instructo.” The characters of particular importance 
for the distinguishing of the species are: 1°. rhizome, 2°. shape of 
lamina, 3°. size, 4°. number of veins, 5°. pubescence, 6°. texture, 7°. 
Position and shape of the sori, and 8°. the sporangia. 
The paper has an introductory chapter dealing with the syste- 
matical and diagnostical matters and with the geographical distri¬ 
bution of the group within America. 
An artificial key is placed before the systematical and descrip- 
tive treatment of the species. In all 84 species are enumerated, and 
of them the following are new: D. atrovirens; D. Bangii; D. coluyn- 
biana; D. Hieronymnsii; D. Lindmani; D. mertensioides; D. Mosenii; 
D. Reguelliana; D. rioverdensis; D. Rosenstockii. New combinations 
are: D. consiniilis {Gymnogramme consimilis Fee); D. delicatula ( Phe- 
gopteris delicatula Fee); D. pachyrachis, var. crassipes {.Nephrodium 
crassipes Sodiro) and var. straminea {Nephrodium stramineum Sodiro); 
D. rivularioides, var. Arechavaletae [Aspidium Arechavaletae Hieron.; 
Polypodium camporum Lindman); D. sancta, var. Balbisii {Polypo¬ 
dium Balbisii Sprengel); D. concinna , var. elongata {Phegopteris 
elongata Fournier); D. ptarmica, var. asplenioides {Gymnogramme 
asplenioides Sw.). New varieties are: D. opposita, var. longissima and 
var. getaensis; D. coarctata, var. longipes; D. panamensis, var. Gon- 
zalezii; D. pachyrachis, var. bogotensis; D. Germaniana, var. glatt- 
