124 BOTANICAL GAZETTE [FEBRUARY 
Trichodesmium Thierbauttit Gomont.—Colonies green, forming 
extensive disconnected ‘‘sea blooms”’; collected in plankton be- 
tween Hawaii and Laysan. 
T. contortum Wille.—Colonies bright yellow, spirally twisted; 
habit like the preceding; collected in plankton between Hawaii 
and Laysan. 
Spirulina major Kuetz.—Plant mass dark blue-green; usually 
scattered among other algae, as on the sides of wet cliffs and near 
the mouths of the very numerous moist caverns or ‘‘lava-tubes’”’ 
which honeycomb the Hawaiian mountains, from sea level to the 
highest summits. 
S. subtilissima Kuetz.—Plant mass mucous, dark green; col- 
lected at Laysan Island in washings from marine algae. 
Phormidium Crosbyanum Tilden.—Plant mass 2 cm. thick by 
5 cm. diameter, impregnated with lime, somewhat hard, bluish 
green to reddish brown; forming flattened globose cushions on 
rocky shelves along the coral reefs and ledges, between tide 
marks. 
P. papyraceum (Agardh) Gomont.—Plant mass expanded, 
glistening, thin, leathery, dark green; on wet rocks and cliffs, and 
around water-tanks, troughs, flumes, etc.; abundant. 
P. laysanense Lemm.—Known only from Laysan Island, where 
it was collected on Turbinaria. 
P. favosum (Bory) Gomont.—Plant mass moderately expanded, 
papery or thick, attached at base, floating; on sides and bottoms of 
irrigation ditches and troughs, tanks, etc.; not uncommon. 
Lyngbya mucicola Lemm.—Epiphytic; known only from Laysan 
Island, where it was collected on Chondrocystis Schauinslandit. 
L. rivulariarum Gomont.—Occurring in masses of Nostoc, in 
lowland ditches and taro patches; not uncommon. 
L. subtilis W. West.—Filaments solitary and scattered; in pools 
and ditches in the lower zones of the larger islands. 
L. distincta (Nordst.) Schmidle—In irrigation ditches and 
streams; fairly plentiful; also found among the filaments of such 
other algae as Pithophora spp. 
L. cladophorae Tilden.—Epiphytic on filaments of Cladophora, 
in the mountain streams. 
