1918] MacCAUGHEY—HAWAIIAN ALGAE 127 
common around water troughs, tanks, flumes, and similar moist 
situations. 
N. verrucosum (Linn.) Vaucher.—Colonies often gregarious, 
up to ro cm. in diam.; at first solid, gelatinous, firm, spherical, 
later hollow and torn; forming small, black-green, shotlike balls, 
covering the sides of pools in falls and rapids of the streams in the 
montane rain forests; not uncommon. 
Nodularia hawaiiensis Tilden.—Plant mass or colony stringy, 
dark green, in tufts along the outer margins of the coral reefs; 
constantly washed by the surf; fairly common. 
Anabaena variabilis Kuetz.—Colonies gelatinous, spreading on 
damp soil or floating free, dark green; on bottoms and sides of irri- 
gation ditches, taro patches, and other moist places; this, like the 
following species, is usually found in connection with other algal 
forms. 
A. catenula (Kuetz.) Born. and Flah.—Colonies gelatinous, 
floating, blue-green; frequent in stagnant water of rice fields and 
taro patches; sometimes in mountain streams, but not recorded 
from high altitudes. 
A. confervoides Reinsch.—Colonies thin; floating in taro 
patches and other shallow water; sometimes rather abundant, but 
usually rare. 
Cylindrospermum stagnale (Kuetz.) Born. and Flah.—Colonies 
floccose, expanded, indefinite, mucous; attached or floating; on 
wet cliffs and in the vicinity of waterfalls, chiefly in the rain 
forests. 
C. catenatum Ralfs.—Colonies mucous, orbicular-confluent, 
indefinite, blackish green; along the mountain streamways, on 
rocks and wet clifis; abundant in certain localities. 
Richelia intracellularis J. Schm.—Endophytic, with single 
trichomes; found living in the cells of Rhizolenia styliformis and 
Hemiaulis delicatus; collected in plankton between Hawaii and 
Laysan. : 
Aulosira Schauinslandii Lemm.—Filaments free and equal; 
scattered or fasciculate; collected on Turbinaria at Laysan. 
Michrochaete vitiensis Askenasy.—Colonies loosely caespitose, 
short, tomentose; collected growing on Liagora coarctata at Laysan. 
