1913] CURRENT LITERATURE 463 
include some additional species, but the Cyperaceae (19 genera and 97 species, 
6 of which are new), Rubiaceae (16 genera and 36 species, 11 of which are new), 
and Filices (39 genera and 86 species, 18 of which are new) are presented with 
a measure of completeness. Aside from these families, the largest additions 
of new species are to Ericaceae (14), Euphorbiaceae (12), and Musci (10).— 
j-M.C 
Paleobotanical literature.—The third volume of JoncMANn’s Die. palaeo- 
botanische Literatur has appeared,® including the bibliography of 1910 and 
1g11. The great usefulness of this publication needs no explanation, and 
now that paleobotany has come to be an essential part of the morphology of 
vascular plants, it will serve a much larger group of botanists than the title 
once would have indicated. The list of authors (40 pp.) includes 374 names, 
representing 762 titles. The list of literature is admirably re emcie so that 
almost any clue can be followed to the literature of a subject.—J. M 
NOTES FOR STUDENTS 
The mucors.—Prominent among recent publications on the Mucoraceae 
are two papers by HAGem? which deal with the distribution, taxonomy, and 
physiology of the soil-inhabiting mucors occurring in the vicinity of Christiania, 
Norway. Asystematic search has revealed the presence in the soil of an unsus- 
pected wealth and variety of these organisms, strangely in contrast with the 
rarity of their spores in the atmosphere. = the first paper, which deals with 
Of 
taxonomy and distribution, 20 species are described. these, 16, includ- 
ing 7 new species, were isolated from eae anus the cong: ost of 
th i many times and some da 
ese 
Among the most Sone encountered species, Mucor racemosus, M. oe 
and M. nodosus are abundant in cultivated lands; M. Romannianus is most 
frequent in coniferous forests (50,000 spores per gram of soil), but M. strictus, 
M. flavus, and M., sylvaticus are also common. , Some forms like M. racemosus, - 
M. hiemalis, Absidia Orchidis, and Zygorynchus Moelleri are widely distributed 
both in cultivation and in forest soils. As showing the rarity of the spores of 
mucors in the air, only 8 species were isolated by means of Petri dishes con- 
taining culture media, and exposed for periods of 1-2 hours both in town and 
country. 
The second paper deals chiefly with problems of nutrition. A large num- 
ber of compounds were tested with respect to their availability as sources of 
6 Joncmans, W. J., Die palaeobotanische Literatur. Bibliographische Ubersicht 
iiber die Avbelien aus ae Gaius der Palaeobotanik. Dritter Band. Die Erschei- 
nungen der Jahre 1910 und rg11 und Nachtrige fiir 1909. pp. 569. Jena: Gustav 
Fischer. 1913. 26. 
7 HaGEM, _ Untersuchungen iiber ue scree * Vidensk. 
Selsk. Skrift. no. 7. pp. 50. figs. 22. 1907; ibid. IT. no. 4. pp. 152. 19 
