5 wh BOTANICAL GAZETTE [AUGUST 
the most significant fact, and one about which there can no longer be any 
me is that chlorophyll inheritance is sometimes Mendelian and sometimes 
on-Mendelian. Naturally this suggests that other types of characters also 
may be, at least in some cases, non-Mendelian in inheritance.—M. 
COULTER 
Plagiotropic shore plants.—From the results of experiments carried on 
largely with Atriplex prostratum, TURESSON® reached the conclusion that the 
external factor causing prostrate growth is intense illumination, but that the 
growth movements are really geotropic in their nature. Emphasis is placed 
upon the fact that there are apparently two distinct sorts of plagiotropy, the 
one resulting from congenital habits of growth, and the other from response " 
to environmental conditions. At times a single species, such as the one 
under experiment, will prove to consist of two such forms.—GEo. D. FULLER. 
Haustoria of Meliola.—Miss Dompce,’ in continuation of her studies of 
South African Perisporiaceae, has examined the haustoria of Meliola, whose 
species occur chiefly on leaves and shoots of forest trees and shrubs. She 
determined that the species are true parasites, sending haustoria into the cells 
of the host, penetrating the cuticle and in some cases sclerenchyma cells. 
The species differ in the length and character of the penetrating filament.— 
LMC. 
North American flora.—Part 2 of volume 32 includes a continuation of 
Rubiaceae by STANDLEY. The preceding part included 20 genera, to which the 
present part adds 41 more. uch the largest genera are Bouvardia with 30 
species (12 new) and Exostema with 26 species (5 new). The remaining 5 
new species are distributed among the smaller genera.—J. M. C 
Vegetation of Paraguay.—Continuing his report on the scientific results 
of a botanical expedition to Paraguay, CHopat® discusses the Apocynoceae, 
Urticales, and Araceae observed and collected. A number of new species are 
described, and rather extensive notes are made on distribution and ecology.— 
EO. D. FULLER 
6 TURESSON, aig The cause of plagiotropy in maritime shore plants. Lunds 
Univ. Arsskrift. N.F. Avd. 2. 16:no. 2. pp. 32. pls. 2. 1910. 
7 Dowce, Era -, South African Perisporiaceae. VI. The haustoria of the 
genera Meliola and rai Trans. Roy. Soc. S. Africa 9:117-127. figs. 7. 1921. 
§ CuopaT, R., La végétation du Paraguay. Fasc. 3. Geneva. pp. 291-379. figs- 
53. 1920. 
