1918] MacCAUGHEY—HAWAIIAN ALGAE 129 
stagnant pools on the.slopes of Mauna Kea, adhering to leaves, 
etc., in the water. 
T. distorta (Hofman-Bang) Kuetz.—Colonies caespitose-floccose 
or cushion-like, blue-green or brownish; forming tufts or cushions 
on stones in the mountain streams; plentiful in the montane rain 
forest zone. 
STIGONEMACEAE 
Hapalosiphon fontinalis (Agh.) Bornet.—Colonies dull blue- 
green, 3 mm. high; found in shallow stagnant pools on Mauna Kea, 
adhering to leaves and other litter. 
Fischerella ambigua (Naeg.) Gomont.—Colonies crustaceous, 
orbicular, up to 1 mm. thick, brown becoming black; on moist 
soil on shady places, on the lowlands, and in the rain forests. 
F. thermalis (Schabe) Gomont.—Colonies 0.5 mm. thick, 
cushion-shaped, woolly, expanded, blackish olive or blue-green; 
collected in warm pools in the vicinity of Kilauea Crater. 
var. mucosa Lemm.—Habitat as for the species; luxuriant 
algal growths occur in these warm springs. 
Stigonema aerugineum Tilden.—Colonies forming a brown, 
membranous layer on the bottoms of shallow quiet pools. 
S. ocellatum (Dillwyn) Thuret.—Colonies cushion-shaped, 
woolly, brownish; frequent in quiet shallow pools. 
S. minutum (Agh.) Hassall.—Colonies crustaceous or cushion- 
like, thin, fragile, blackish; collected on moist stony soil in the 
vicinity of Hilo, Hawaii. 
RIVULARIACEAE 
Calothrix confervicola (Roth) Agh.—Filaments gregarious, 
stellately fasciculate, attached, rigid; collected as epiphytes on 
marine algae, at Laysan. 
C. aeruginea (Kuetz.) Thuret.—Filaments forming a some- 
what continuous light blue-green layer on the surfaces of larger 
algae; common in tidal pools along the coral platforms and rocky 
shores. 
C. crustacea Thuret.—Colonies caespitose, velvety, widely 
expanded, blackish green or brownish; epiphytic on other algae in 
tidal pools and along the reefs. 
