240 BOTANICAL GAZETTE [MARCH 
regions, Greenland “‘stands highest,” with 41 per cent of the Icelandic forms, 
but the total number of species in Iceland exceeds that of any other arctic 
region. 
GALLgE presents the lichen flora under six aspects: (1) a list of species 
(284 species in 55 genera); (2) the means of propagation and dispersal; (3) the 
“biology”? under four categories, bark lichens, epiphyllous lichens, earth 
lichens, and rock lichens; (4) the classification of the lichens into associations; 
(5) the vertical distribution of the lichens; and (6) the abundance of lichens 
in Iceland. The classification into associations is based upon the character of 
the substratum and of the vascular plants. Iceland is shown to have a lichen 
vegetation poor in species in proportion to its area. Epiphyllous lichens are 
entirely lacking in such a climate, and bark lichens are scanty in their occur- 
rence. On the contrary, the conditions for the development of earth and 
rock lichens are better than in the temperate or tropical regions. It follows 
that, in spite of the rigorous climate, the soil and rocks show a large number of 
specimens. The lack of data regarding mos development is regretted, and 
an effort is made to remedy it by presenting tl accord 
ing to the RAUNKIAER method.—J. M 
MINOR NOTICES 
orth American flora.—The fourth part of Volume 7 continues the 
akties by J. C. Artuur, who in collaboration with F. D. Fromme pre- 
sents Dicaeoma on Poaceae, 88 of the 269 species listed in the analytical key 
being included in the present part, 43 of the names being new combinations. 
The tangle of synonymy involved in such a group is very impressive.— 
NOTES FOR STUDENTS 
Taxonomic notes.—BRITToNn,’ in collaboration with several botanists, has 
published descriptions of 170 new species of Cuban plants, distributed among 
many families, and including 10 new genera as follows: Bembicidium and 
Canizatesia in Leguminosae; Ramsdenia, Roigia, and Dimorphocladium in 
Euphorbiaceae; Cheilophyllum, Silvinula, Naiadothrix, and Anisantherina in 
Scrophulariaceae; and Cotema in Bignoniaceae. 
WIi.i1aMs;' in anticipation of publication in the North seven flora, 
has presented the results of his study of the Calymperaceae, “partly to allow 
the illustration of cross-sections of the leaves to be issued with the descriptions.” 
This family of mosses includes only the genera Syrrhopodon and Calymperes, 
the former containing 18 species (1 new) and the latter 12 species (3 new). 
7 Britton, N. L., Descriptions of Cuban plants new to science. Mem. Torr. 
Bot. Club 16:57-118. 1920. 
§ WizuiaMs, R. S., Calymperaceae of North America. Bull. Torr. Bot. Club 
47:367-396. pls. 15-17. 1920. 
