138 BOTANICAL GAZETTE [FEBRUARY 
Nematophyton, of which no fruit has yet been obtained. The stem 
structure however is pseudo-exogenous, and closely like that of many 
Laminaria. A remarkable and misleading crystallization effect was 
described. The paper was fully illustrated by photographs projected 
by the stereopticon. 
G. T. Moore: Wotes on the morphology and reproduction of Chlorocystis 
Cohn. (By invitation.) 
This unicellular alga, growing on Enteromorpha, was described, 
several errors of earlier observers corrected, and some new information 
given. It is not always an endophyte but as often an epiphyte. The 
chromatophore varies from the one-sided arrangement, hitherto con- 
sidered typical, to a complete lining of the wall. Two sizes of z00- 
spores are formed, but no conjugation is probable. Discharge of the 
zoospores occurs through a circular opening and not through a tubular 
neck as formerly described. 
D. T. MacDovueat and F.E. Luoyp: Zhe roots and mycorhizal adapia- 
tions of the Monotropacee. (By invitation.) 
The authors have investigated AMonotropa uniflora and describe the 
histology of its roots, and the structure and mode of entrance of the 
fungus. In general the following seems true of all Monotropacee so 
far studied : the shoots lack chlorophyll and usually stomata; the usual 
relations of size of shoot to root are lost; the stele is much reduced 
and consists only of perforated vessels and companion cells; the fungus 
encloses the tip and penetrates the epidermis, forming special structures 
in the latter. The relation of fungus to host is a pure symbiosis. 
R. THAXTER: The structure and reproduction of Compsopogon. 
The author gave some account of the distribution of Compsopogon 
in Florida and described its general structure, calling attention to the 
fact that the older filaments may possess a cortex consisting of from 
two to four layers of cells. The details of cell structure and the normal 
reproduction by aplanospores were illustrated, as well as the formation 
of smaller aplanospores derived from sorus-like groups of superficial 
cells. The paper will be published in full in the Boranicat GaZeETTE: 
HERMANN VON SCHRENK: Some diseases of New England Conifere. 
(By invitation.) 
The coniferous woods of this region are being destroyed by the 
mycelia of a number of fungi, chiefly of the genus Polyporus, which 
