ft 
No 
Notes on the Blue-green Alge, etc. 
. Cells 2-5-5 mic. in diameter, 2-°5-4-2 mic. long 
Stratum bluish-green or _ scattered ; 
trichomes straight, flexible, slightly con- 
stricted at joints ; apex tapering, capitate, 
hooked or undulate; apical cell with 
conical calyptra; transverse walls with 
fine granules. Hot springs and on rocks, 
trees. etc... (Gaeezenuen Oy Leer. A.) 265) 
42. Cells 4-9 mic. in diameter, 2-6 mic. long, 
42. Stratum thin, cobweb-like, dark purple 
_ 
S} 
stratum dark green, expanded. 
Trichomes 4-4-8mic. in diameter, 
straight, somewhat flexuous, not con- 
stricted at joints; apex slightly tapering, 
curved capitate; apical cell with de- 
pressed conical calyptra; cells 3-6 mic. 
long, transverse walls granular. In 
swiftly running water on stones. (G., 
TOO. Sy 2526 eels LOG, 0520-01.) 
3. Sheath thin, becoming blue in chlor-zinc-iodide, P. 
Stratum indurated with lime, stone- 
like, mamillose; trichomes 3-4 mic: in 
diameter, not constricted at joints; apex 
straight, tapering for very short distance, 
not capitate; cells 3-5 mic. long; apical 
cell obtuse, no calyptra. (G., 170.) 
43. Sheath thick, lamellose, not becoming blue in chlor- 
44. Transverse walls obscured by granules 
zinc-iodide _ a ET Gots oe 
Stratum indurated with lime, compact, 
very hard; trichomes 3-4-5 mic. in dia- 
meter, not constricted at joints; apex 
straight, tapering slightly, not capitate ; 
cells 2-3-5 mic. long; apical cell conical, 
no calyptra. (G., 171, 4, 28-30.) 
Stratum membranaceous, blue-green ; 
trichomes straight or curved, not con- 
stricted ; cells 3-5 mic. in diameter, 4-8 
mic. long ; apex straight, briefly tapering, 
not capitate; apical cell obtuse, conical. 
Margins of ditches, moist earth, dripping 
water, . (Gi. L72rs 4yetk-g2)- se fOGs A. 
69-70.) 
44. Transverse walls usually conspicuous, not 
45. Sheath present, thin, blue in chlor-zinc-iodide 
1g13 Oct. 1. 
granulated a ie ee ae 
Stratum membranaceous, leathery, 
dark blue-green or black; filaments elon- 
gate, not constricted at the joints, en- 
tangled ; cells 3-4-5 mic. in diameter, 3-4-8 
mic. long; apex straight, apical cell 
obtuse, conical. On stone-work and timber 
of mill-dams, in ponds, etc. (G., 172, 5, 
I-2 ;+ Toor, 45-70-72:) 
Stratum dark green, thin, leathery, 
fragile when dried, papyraceous, sometimes 
diffuent; filaments strongly flexuose, 
intricate; cells 3-5'mic. in diameter, 2-4 
mic. long; apical cell attenuate, obtuse, 
conical. On timber in mill-dams, on 
ee 
O. amena 
P. setchellianum 
umbilicatum 
P. toficola 
.P. inundatum 
P. corium 
papyraceum 
913 
40 
