80 BOTANICAL GAZETTE [yuLy 
finds that there is little reason to suppose that they are of any service in protecting — 
the flowers from ants.—C. R. B. 
Centrosomes in Marchantia.3°—After a study of spermatogenesis in Mar- — 
chantia polymorphia, SCHA¥FNER concludes that IKENO’Ss account is correct and 
that centrosomes are present, both while the nucleus is at rest and while it is under- — 
going mitosis. His figures are practically the same as IKENO’s. MIVAKE’S — 
failure to find centrosomes he attributes to differences in technic.—CHartes J. 
CHAMBERLAIN. E 
Thermotropism.—Pout3’ describes observations and experiments that he é 
has made upon the cultivated flax, which show its great sensitiveness to radiant — 
heat, the young shoots directing themselves toward the source. Experiments also 4 
show that heat is the dominant factor in inclination of the shoots, which is often — 
ascribed to light —C.'R. B. 
Discomycetes.—Miss BACHMAN has publisheds* a descriptive catalogue of 
the Discomycetes within five miles of Oxford, O. Keys to genera and species are 
provided, and there are illustrations of ten of the sixty-odd species, a goodly % 
number of which are now for the first time reported from southwestern Ohio.— 
ce. 5: 
Light and respiration. —Lowscuin reports that when he excluded the effects Z 
of actinic warming he was unable, in tl ; 
the respiration of certain fungi (Aspergillus, Penicillium, 
sporium), to detect any regular acceleration of it by light —C. R. B. 
3° SCHAFFNER, JoHN H., The centrosomes of Marchantia polymorphia. Ohio” 
Naturalist 9: 383-388. pl. 27. 1908. 
37 Pohl, J., Der Thermot 
ropismus der Leinpflanze. Beih. Bot. Centralbl. 24:11- 
131. figs. 6. 1908. 
38 BACHMAN, FREDA M., Discomycetes in the vicinity of Oxford, Ohio. Pr 
Ohio State Acad. Sci. 519-70. pls. 4. 1909 
_ _% Lowscuin, A., Zur Frage iiber den Einfluss des Lichtes auf die Atmung 
niederen Pilze. Beih. Bot. Centralbl. 23: 54-64. 1908. 4 
