MICROSPORA 179 
September ; Central Park, June (613A), October (664A) ; Pelham 
Bay Park, May (394B), September (486). 
This species has been observed repeatedly in several stations, 
always showing a very constant character, and never mixed with 
other forms. It is the only Mierospora that has been observed in 
the herbaceous grounds of the New York Botanical Garden, in a 
stream where Spirogyra, Tribonema, Draparnaldia, and Myxonema 
abound. It is well marked by the nearly square shape of the 
cells (in optical section), and by the fine bead-like edge of the 
'chromatophore. 
Young specimens collected in October showed a slightly nar- 
rowed basal cell imbedded in mucus, appearing somewhat like a 
small Ulothrix in the manner of attachment. It is probable that 
these plants germinated from akinetes which had lain dormant 
during the heat of the summer. 
Microspora quadrata is perhaps very nearly allied to, if not 
identical with the M. punctalis of Rabenhorst and recent authors. 
There is considerable doubt, however, whether it is the Conferva 
punctalis of Dillwyn and it is almost certainly not C. punctalts 
Mueller (Nov. Act. Acad. Sci. Imp. Petrop. 3: 90. Pl. r. f. ۰ 
1788) to which Dillwyn's figure and description supposedly 
applied. Mueller’s species was probably a form belonging to the 
Mougeotiaceae. Agardh (Spec. Alg. 83. 1824) was of the opinion 
that C. punctalis Dillw. ad 57. and Lyngb. ۸۰ 46, was a species of 
Zygnema. 
DOUBTFUL Forms 
MICROSPORA VULGARIS Rabenh. Krypt. Flor. Sachs. 1: 245. 
1863; Flor. Eur. Alg. 3: 321. 1868. 
Conferva vulgaris Kirchn. Krypt. Flor. Schles. 2': 79. 1878. 
Wolle, F. W. Ale 142. ۸۰ 27. f. 6-13. 1887. 
ConFERVA FArRLowII Wolle, Bull. Torrey Club, 6:140. 1887. 
C. vulgaris Farlowi Wolle, F. W. Alg. 142. 1887. 
Microspora Farlowii Rabenh. Ale Eur. 2566. 1878. 
All the above as represented in the Wolle herbarium appear to 
be forms of Zribonema, also Tilden, Am. Alg. 27. 1894, at least 
for the most part. Saunder's figure of M. vulgaris Farlowiü (Flora 
of Neb. pl. 22. f. 3. 1894) is evidently Zridonema. 
Microspora FUGACISSIMA (Roth) Rabenh. Flor. Eur. Alg. 3: 
321. 1868 
