1897 | CURRENT LITERATURE 133 
the fact that increase in body substance is so largely due to a non-growing 
substance — water—-diminishes the value of the percentage increment curve 
of growth.—J. M. C 
Dr. BRADLEY M. Davis” has published an interesting account of the 
vegetation of the hot springs of Yellowstone Par He finds that many of 
the peculiar forms of deposit in and about the springs have been determined 
by the presence of certain alge. The manner in which these alge have 
determined the “columns and moldings” is described in a convincing way. 
The subject thus opened up is one of great interest, and suggests further 
research into the conditions of growth in these hot waters. The paper is not 
a technical presentation of the subject, as the algae forms concerned have not 
been sufficiently studied, but it presents the most obvious effects of their 
presence.—J. A. 
THE QUESTION of the nomenclature of the North American species of 
Leucobryum does not seem to be fully settled yet in spite of Mrs. Britton’s 
careful study in the Bud’. Torr. Bot. Club 19: 189. 1892. In the Journal de 
Botanigue for March 16th, M. Emile Bescherelle discusses the matter and 
concludes that the following is the correct synonymy : 
LEUCoBRYUM MINUS (Dill). Sull. 
Bryum albidum et glaucum, fragile, minus Dillen, Spec. Musc. Appendix 546. 
#).,.83. 17a. 
Dicranum albidum Bridel, Musc. Recent. 167. 1798.-Spec. Musc. 205. 1806. 
Dicranum glaucum var. albidum Weber et Mohr, Bot. Tasch. 166. 1807.- 
Bridel, Bry. Univ. 1: 409. 1826 
Leucobryum ssiyents Hampe var. mzzus C. Miiller, Linnea 18: 687. 1844.- 
Synop. Musc. 1: 75. 
Leucobryum minus fie MS. in Sull. Moss. of U. S. 24. 1856. 
Leucobryum albidum (Brid). Lindberg, Mossor. Synon, 21. 1863. 
Leuco gic minus Hampe fide Lindberg in Mossorna uti Dillenit Historia 
Muscorum 35. : 
Len mi Era minus Sullivant in Lesq. et James, Man. Moss. N. Am. gI. 1884, 
DISTRIBUTION: Europe: N. America —Ohio (Sw//. no. 77, 98); Penn. 
(Torrey fide Britton); Central America; Mexico (Ga/eotti no. 6871). 
LEUCOBRYUM MINUS (Dill.) Sull. forma PUMILA Besch. 
Bryum (Dicranum?) minus, f, pumtlum Michaux in Herb. Mus. Paris. 
Dicranum glaucum: pumilum Michaux, Flora Bor. Am. 2 :— 180 
eucobryum vulgare var. minus Hampe, Linnea 13: 42. 1839 fide Mrs. Britton. 
a Leucobryum sediforme Lesq. et James, Man. Mosses N. Amer. 91. 1884 fide Mrs. 
Tritton 
te nae pumilum (Michx.) Britton, Bull. Torr. Bot. Club 1g: 189. 1892. 
DisrRipuTION: N. America— Carolina (Michaux); Alleghany mts. 
~ Science 6: 145-157. 1897. 
