ac ce 






1901] CURRENT LITERATURE 213 
to Aster), WVerisyrenta is substituted for the untenable Parrasia Greene 
(Greggia), and Evemosemium is substituted for Grayda of the western deserts 
on account of a prior use of the name. The same author (dem 227-241. 
1901) has begun the segregation of Zavaxacum in North America by 
describing eight new species; and has described new species under 7ha/tc- 
trum, Rumex (2), Lappula, Allocarya (2), Solidago, Coleosanthus (5), Coreop- 
sts, Parthenium, Picradenia, and Zygadenus (2).— M. L. FERNALD (Rhodora 
230-233. P/. 27. 1900) has described two new northeastern species of 
Thalictrum, and two new varieties of Scirpus maritimus (idem 241. 1900), 
and has presented (zdem 3: 13-16. 1901) Monarda fistu/losa and its allies.— 
B. L. ROBINSON (Rhodora 2: 235-238. 1900) has discussed and reorganized 
the nomenclature of the New England representatives of Agrimonia, has 
presented (¢dem 3:11-13. 1901) the results of his search for the type of the 
Linnean Guaphalium plantagintfolium which proves to be 4. planiaginea as 
interpreted by Fernald, and has discovered (édem 16-17. 1901) that Sésym- 
rium Niagarense Fourn. should be transferred as a doubtful synonym under 
S. officinale L. to Brassica nigra Koch.—G. E. DAVENPORT (Rhodora 3: 1-2. 
Bl. 22. 1901) has deecetiaet: a new plumose variety of Asplenium ebeneum 
from Vermont.— J. M. GREENMAN (Rhodora 3 : 3-7. 1901) has set forth the 
genus Senecio as it exists in New England, describing two new varieties of 
S. Balsamitae— SPENCER LE MOORE (Jour. Bot. 38: 457~469. Ai. 476. 1900) 
has described two new genera of Compositae from Africa (De/amerea and 
Nicolasia), both belonging to the Inuloideae —A. B. RENDLE (Jour. Bot. 
39: 12-22. Igor) has described eleven new species of /fomoea from Africa.— 
F. LAMSON-SCRIBNER and ELMER D. MERRILL (U. S. Dept. of Agric., Div. 
of Agrost. Bull. 24: 1-54. 1901) have published new species of 77ifsacum, 
Andropogon (3), Paspalum (2), Panicum (3), Muhlenbergia, Agrostis, Tris- 
tachya, Leptochloa, Aristida (2), and Elymus (5); and have given the results 
of a study of the types of Panicum nitidum, P. pubescens, and P. scoparium.— 
J. M. C. 

IN A RECENT PAPER Hans Fitting * has given the results of his investiga- 
tions on the mode of origin of the megaspores, and the development of their 
Coats in Isoetes and Selaginella. His work was done chiefly with living spores 
examined in a physiological salt solution, and in water. Microtome sec- 
tions were used to trace the phases of karyokinesis in the spore mother cells, 
and for a check on the conclusions drawn from the living materia 
He agrees with Smith” in his account of the origin of the sporangium of 
Isoetes. It will be remembered that the latter author differed from Goebel, 
Bower, and Campbell, in asserting that “the rudiment of the sporangium is 
**Bau und Entwickelungsgeschichte der Makrosporen von Isoetes und Selagi- 
nella, etc. Bot. Zeit. 58: 107-164. pls. 5-6 
7 Bor. Gaz. 29 : 225-258, 323-346. pls. 22-20. 1900. 
