6I. 
63. 
63. 
Notes on the Blue-green Alga, etc. 
flexuous, not constricted at joints; cells 
4°7-6°5 mic. in diameter, 4:7-6-5 mic. long ; 
apex tapering; apical cell obtuse (may 
be ro,mic. long), not capitate; no calyp- 
tra. In salt marshes, brackish ditches 
and pools;, ete. (G.220, 7; Toi:s Ly a7, 
4, 27.) ; 
In fresh water ae 
Stratum somewhat membranaceous, 
often floating, dark olive-green or black ; 
trichomes straight or slightly flexuous : 
cells 8-5 mic. in diameter, 8-5 mic. long ; 
apex tapering, obtuse rounded; _trans- 
verse walls distinctly granulated. In 
stagnant waters; on moist cliffs above 
high tide. (T. 70.) 
62. Trichomes slightly constricted at the joints, 
Stratum dark blue-green; trichomes 
elongate, flexuous, transverse walls some- 
times finely granulated; cells 4-6 mic, 
in diameter, 2:5-5mic. long; apex 
tapering, obtuse, curved. Floating in 
water in tufts, or on mud at bottom; 
in greenhouses; on dripping rocks, etc. 
Tes 2SOre Fe 16 ; ili gtetow 4h, 33-) 
62. Trichomes not constricted : 
Apical cell rounded j 
Stratum blue- -green ; trichomes Bcatatit 
fragile, not constricted at joints ; cells 
3-4 “mic. in diameter, 1-6-5 mic. long; 
transverse walls with granules here and 
there; apex tapering, no calyptra. (G., 
227, 7,133 T.,° 79; 4, 39.) 
Apical cell sub-acute .. a. Be ote 
Stratum olive green ; trichomes fragile ; 
not constricted at joints; inflated re- 
fringent cells here and there; cells 4-6°5 
mic. in diameter, 1-5-2-8mic. long, 
transverse walls not granulated; apex 
tapering, subacute, uncinate, not capitate. 
In marshes and pools and on damp 
earth, 4)(Gi7 220, 7eye ns: OE sw 7G) Capen) 
Var. neapolitana, see G. ,page 229. 
64. Trichomes 2-7-3-3 mic. in diameter 
Stratum mucous bright blue-green ; 
trichomes straight or nearly so, monili- 
form; cells 3-7-8 mic. long, protoplasm 
with large granules; sheaths not coloured 
blue by chlor-zinc-iodide; apex not 
tapering, not capitate, no calyptra. On 
leaves of Potamogeton, etc. (G., 163, 4, I2). 
64. Trichomes 1-7-2 mic. in diameter - 
Stratum membranaceous, purple on 
surface, grey or blue-green underneath ; 
filaments nearly straight, entangled ; tri- 
chomes fragile, slightly constricted at 
joints ; cells 1-8-4-7 mic. long, not granu- 
lar; apex not curved, not tapering, 
rounded, no calyptra. In fresh water. 
(G-,° 265, 4,'197-18;, F., 95, 4, 56-57.) 
1913 Nov. 1. 
O. nigra 
O. formosa 
O. animalis 
O. brevis 
P. melie 
P. luridum 
405 
63 
