MICROSPORA 169 
Synopsis of Species 
Filaments large, cell-walls 1.5-3 x thick. 
arly cylindrical, diameter 28-33 4, 1-1.6 times as long. I. M. crassior. 
Cells nearly cylindrical, diameter 21.5-25 u, 1-2 times as long. 2. AZ amoena. 
Cells somewhat tumid, diameter 16.5-20 u, 1-2 times as long. 3. M. Loefyrenit. 
Cells perfectly cylindrical, diameter 19.5-20 u, 1-236 times as long. 
4. M. Wittrockii. 
Filaments smaller, cell-walls thin. 
Cells cylindrical, diameter 14-17 u. 
Cells cylindrical, diameter II-I4 u. 
Cells cylindrical, diameter 7.5-9.5 u 
Cells slightly constricted, diameter 6. 7-9.5 u. 
Cells cylindrical, diameter 5.5-7 م‎ 
. M. floccosa. 
M. Willeana. 
M. stagnorum. 
. M. tumidula. 
M. quadrata. 
P وم‎ AN 
1. Microspora crassior (Hansg.) 
M. amoena crassior Hansg. Sitz.-ber. K. Böhm. Gesell. Wiss. 
1889': 129. 1889; Prod. Alg. Bohm. 2: 223. 1893. Schmidle, 
Ber. Deutsch. Bot. Gesell. 11 : 544. 1893. 
M. amoena crassa Schmidle, Ber. Nat. Gesell. Freib. 7 75. 
JL. 2. f. 2. 18935. 
M. amoena forma crassior Wille, Rhodora, I : 149. 1899.* 
Filaments long and dark green: cells nearly cylindrical, 
28-33 £ in diameter, 1—1.6 times as long ; cell-wall 2.5—3 ۸ thick, 
the lamellate structure often distinct ; chromatophore dense, usually 
covering the whole cell-wall and obscuring the large nucleus (ai 
27-7-2) 
Exsic.: Phyc. Bor. Am. 676 p.p. Bridgeport, Conn., April, 
1893 (I. Holden). (?) 
Growing in thick, tangled masses in rapid water, or as scattered 
filaments with M. amoena or M. Loefgrenit. 
New York : Larchmont, May (588); Van Cortlandt Park, 
June (632) ; Central Park, June (620), September (490), October 
(659). 
This species is distinguished from M. amoena, chiefly by its 
*Schmidle (1900) quotes as an additional synonym Microspora De Toniana 
Lagerh. Nuova Notarisia, 4: 137. 1893, and states that of the three names proposed 2 
himself, Hansgirg, and DeToni in the red 1893 it is difficult to decide which h 
priority. He has overlooked the fact that Hansgirg's variety was actually beer: 
in 1889. Schmidle also thinks it probable that Spy Raciborskii Gutwinski (Flora 
Glon. Galicyi 7. ai 5. f. z. 1892; Nuova Notarisia, 3 : 17. 1892) is to be identified with 
this form. The correctness of such an identification جج‎ to us to be more than 
doubtful ; vg the form called C. Ractborskit by West (Journ. Bot. 
333. f- 9. 1893) ag TA from Microspora crassior, in its smaller سے‎ mä 
much thicker cell-w 
