1913] CURRENT LITERATURE 333 
(Phytopathology 2:135-137. pl. 12. 1912) describes and illustrates a new 
fungu apionanag suffulta) , found on an unidentified species of spider at Wiamea, 
Hawaii.—P. C. STANDLEY (Proc. Biol. Soc. Wash. 25:119, 120. 1912) proposes 
a new genus (Wootonella), based on Ximenesia encelioides var. nana Gray.— 
F, STEPHANI (Sp. Hep. 4:801-824. 1912) has issued title-page and index to 
volume 4, and (ibid 5: 1-176) continues the record of species, many of which 
are new to science.—H. and P. Sypow (Leafl. Philipp. Bot. 5: 1133-1147. 1912) 
have published 24 new species of fungi from the Island of Palawan, P.I., an 
include the following new genera: Nematothecium of the Periporiacene & 
Discosiella, a genus related to Discosia.—F. THEISSEN (Beih. Bot. Ce neal 
29: 45-73. 1912) under the title “Zur Revision der Gattung Dimerospori 
characterizes a new genus (Dichothrix) of the Eurotiaceae—W. WEINGART 
(Monatsschr. fiir Kakteenk. 22:83, 84. 1912) has described a new species of 
Echinocereus (E. Weinbergii) introduced into cultivation from North America, 
and (ibid. 106-109) a new species of Cereus (C. Vaupelii) from Haiti—H. F. 
WERNuHaM (Journ. Bot. 50: 156-164. 1912) presents a revision of the genus Ber- 
liera, recognizing 33 species of which 5 are new to science—K. M. WIEGAND 
(Rhodora 14:117-161. pls. 95, 96. 1912) presents an interesting and thorough 
revision of the genus Amelanchier in eastern North America, recognizing 8 
species of which 3 are characterized as new. The revision is of particular 
value on account of a clear key to the species and full citation of exsiccatae.— 
W. Zen (Notizblatt 5: 268-273. 1912) has described several new species in the 
genus Liagora and includes one from California, one from Guadeloupe, and 
one from Brazil.—J. M. GREENMAN. 
Periodicity of tropical vegetation.—On account of the abundance of its 
data, VoLKENs’? report on the results of his observations in Java, 1901-1902, 
is perhaps the most valuable of a series of recent articles upon the problems 
and conditions of foliar periodicity in the tropics. Exact records of the 
behavior of individual trees of over 100 species growing in the Buitenzorg 
Gardens show almost all possible variations of foliage conditions, from trees 
regularly deciduous once or twice a year, through evergreens with marked 
Periodicity, to others with uniform foliage gradually renewed throughout the 
entire year. Attention is directed to the marked individuality not only of 
species and of individual trees of the same species, but also of individuals of 
different ages, and even of different branches of the same tree. VOLKENS 
shows that a moderate amount of climatic periodicity exists at Buitenzorg, 
-€specially in precipitation, relative humidity, and insolation; also that a large 
majority of the trees show a definite foliar periodicity, but concludes that no 
coincidence or causal connection can be established between the two classes of 
phenomena. He rejects as most improbable the influence of the salt content 
ts, 
*VOLKENs, G., Laubfall und Lauberneuerung in den Tropen. 8vo, pp. 142. 
Berlin: Gebriider  Borndcnenes: 1912. 3.80. 
