402 
49. 
49. 
NOTES ON THE BLUE-GREEN ALGZ, 
WITH A KEY TO THE SPECIES OF OSCILLA- 
TORIA AND PHORMIDIUM. 
HAROLD WAGER, F.R.S, 
(Continued from page 374). 
Plant mass slimy, dark olive green .. E O. 
Trichomes straight or curved, con- 
stricted at joints, fragile; cells 7-11 mic. 
in diameter, 3-5 mic. long, transverse 
walls granular; apex tapering, obtuse ; 
apical cell somewhat capitate, outer wall 
convex and slightly thickened. On piles 
in salt water, salt marshes, in plankton 
from= Wiest. Imdicsias((Gias207-5 Os 20) eles 
69, 4, 12.) 
In plankton from West Indies. (See T., 70, 4, 
13-15); West.) J. 07 0t. 1690 i me 
From Greenland. (See De Toni, and a 
page 82) 
50. Apex of trichome usually straight 
Stratum membranaceous, mucous, blue- 
green to dark steel-blue ; trichomes 18- -23 
mic, in diameter, often in narrow bundles ; 
cells 4-5-6mic. long, transverse walls 
granular; apex somewhat _ tapering, 
obtuse. In stagnant waters, borders of 
ponds and pools. (T., page 67.) 
50. Apex of trichome usually curved 3 
Stratum thin, green; trichomes 15" 5- 
18-5 mic. in diameter, cells 4-6 mic. long 
transverse walls granulated; apex some- 
what tapering, obtuse. (See T., p. 83.) 
. Apex of trichome uncinate or undulating, Bata 
nigro-viridis 
O. capitata 
O. subsalsa 
O. major 
O. percursa 
constricted at joints 42 O. letevirens 
Stratum thin, membranaceous, bright 
blue-green ; trichomes fragile, transverse 
walls” sometimes granular ; cells 3-5 mic. 
in diameter, 2°5-5 mic. long; apical cell 
not capitate, obtuse, calyptra none. In 
brackish or salt water; on woodwork 
under an’ old) amuilll) (G., 226, 7; 155) 2.; 
78; 4, 28:) 
. Trichomes 4 mic. in diameter, flexuous or coiled, 
Much constricted at joints, cells nearly 
or quite as long as broad ; apex tapering, 
slightly curved, obtuse, no calyptra. In 
salt water ditches. c page 77°) 
52. Plants in warm or fresh water ; 
52. Plants in salt water, epiphytic : 
Filaments 5-6 mic. in diameter, sheath 
hyaline, trichomes 4-4-5 mic. in diameter, 
irregularly curved, rarely straight, not 
constricted at joints, cells 4-11 mic. long, 
transverse walls not granulated; apex 
straight, tapering, capitate; cell contents 
blue-green. (T., 104, 5, 7-8.) 
O. salinarum 
60 
PR. laysanense 
Naturalist.; 
