D 
MICROSPORA 171 
MassacHusETTS: Middlesex Fells Reservation, July (447B); 
Worcester, 1887.  G. E. Stone. 
New York: East Chester, May (393, 590, 592); Larchmont, 
May (588); Staten Island, December (242). 
New Jersey: Undercliff, Bergen county, March (438), April 
(276), May (125, 573); Englewood, May (362). 
Wolle remarks that this species is not frequent, but is abundant 
where it does occur. It is, however, rather common about New 
York, especially in rapid streams, and probably it is generally dis- 
tributed. 
Microspora LOEFGRENII (Nordst.) Lagerh. Ber. Deutsch. bot.‏ .و 
Gesell. 5: 417. 1887; Flora, 72: 208. 1889. DeToni,‏ 
Syll. Ale 1: 229. 1889.‏ 
Conferva Loefgrenii Nordst.; Wittr. & Nordst. Alg. Exsic. 
421. 1882; Bot. Notiser, 1882: 55. 1882. 
Filaments long; cells slightly but distinctly ventricose, 16.5— 
20 p in diameter, 1—2 times as long; cell-wall 2.5 م‎ thick ; chro- 
matophore dense and covering the whole cell-wall, the nucleus 
obscure, 5—6.5 p in diameter ) 25, کر‎ 3, 4). 
Growing with M. amoena, or in long tangled skeins unmixed. 
M ts: Middlesex Fells, July (447A). 
New York: Westchester county, April (351); Van Cort- 
landt Park, May, June (598, 632). 
Some specimens of this species are so similar in appearance to 
M. amoena that it requires close study to separate the forms, and 
probably this is the reason why it has not before been reported 
from North America. The specimens found in Middlesex Fells 
growing with M. amoena, however, were most distinct from that 
species, always easily separable by the smaller diameter and mo- 
niliform tendency of the filaments; they seem to agree perfectly 
with the material which formed the type (Wittr. & Nordst. Alg. 
Exsic. 42T). Nordstedt’s remark in describing this species, 
* Formà cellularum ad C. amoenam Kitz. et C. Wittrockii ac- 
cedens, structurà membranae differt," seems superfluous, for in 
this type material, the normal Microspora membrane structure is 
clearly recognizable. 
The form issued as M. Loefgrenii forma minor Wille (Phyc. 
Bor. Am. 677, Middlesex Fells, Mass., May, 1899, F. S. Col- 
