grt] CURRENT LITERATURE 415 
well as in Sorosphaera, amoebae are carried into new cells by the division of the 
infected host cell as described above for S ‘pongospora, 
igniera radicalis develops in the root hairs and cortical parenchyma of the 
. 
Toots of Callitriche stagnalis. As stated in the former paper, a true schizoge- 
occurs here as usual before the meiotic divisions. The first of these divisions 
often occurs before the plasmodium has broken up, but in such cases the plas- 
modium breaks up into “energids” during the second mitosis in such a way 
that the four nuclei resulting from the two mitoses are inclosed in the proto- 
plasmic masses, which break up into four spores. The mode of development 
of L. Junci and L. verrucosa is similar to that of L. radicalis. 
Molliardia is described as a new genus to include Tetramyxa Triglochinis 
Molliard. This form is peculiar in producing no spores on the host plant. 
infected cells contain plasmodia which soon break up into uninucleate schizonts. 
These become 2-8-nucleate and break up anew. The full life history of this 
form is not known. In conclusion, the author adds some observations on the 
affinities of the Plasmodiophoraceae. He is inclined to regard them as being 
more closely related to such forms as Rhizomyxa and Woronina among the 
Chytridiales than to the Myxomycetes.—H. HASSELBRING. 
The Grigna mountains.—The Grigna group of mountains includes some 
60 square miles of mountainous country. in northern Italy, adjoining the 
eastern shores of Lake Como and the connecting Lake Lecco. Its phytogeo- 
8taphical description by GErILINGERE* has an additional American interest 
because of the location of the region near the main route of American tourist 
travel. Notwithstanding its small area, the elevation varies from 199 meters 
_ at Lake Como to 2,410 meters on the highest of the peaks. This permits a 
wide range in climate, which is of course reflected in the vegetation. The 
Mediterranean province does not reach so far north, but many species of 
Mediterranean origin are present, and the olive extends to a maximum altitude 
of 490 meters. Most of the area is comprised within the submontane region, 
With forests of oak, hop hornbeam, and chestnut extending up to 1os0 meters. 
From this elevation to 1650 meters the montane beech forests dominate. 
€se in turn are succeeded by the subalpine forests of larch as far as 1950 
meters, above which is the treeless alpine region. For all of these regions the 
author distinguishes ecological groups with a detail seldom approached in 
America. He recognizes seven chief types of vegetation, including forest, 
bush-forest, perennial herbs, grassland, swamps, aquatic vegetation, and rock 
vegetation. These are subdivided into formational groups, formations, and 
Societies, of successively minor importance. This classification is d 
* GEILINGERE, G., Die Grignagruppe am Comersee. Bot. Centralbl. 247: 119-420. 
