1918] MACCAUGHEY—HAWAIIAN ALGAE 125 
L. Meneghiniana (Kuetz.) Gomont.—Plant mass up to 1 cm. 
high; caespitose, fasciculate, mucous, dull blue-green; collected 
on marine algae at Laysan; not known from the other islands. 
L. semiplena (C. Agh.) J. Agh.—Plant mass rarely higher than 
3 cm., caespitose, extensive, mucous, usually dull yellowish green or 
dark green; occurs in the rocky basins of tidal pools along the 
platform reefs of such islands as Oahu and Kauai; also collected 
on marine algae at the Laysan atoll. 
L. confervoides C. Agh.—Plant mass 5 cm. high, caespitose, 
extended, fasciculate, mucous, dull yellowish or dark green; fairly 
common on rocky shores and in tidal pools. 
L. aestuarii (Mertens) Liebman.—Plant mass widely extended, 
either forming a compact woolly layer on moist earth, or a floccose 
mass floating in water, blackish or dull blue-green; common in 
ditches and muddy taro patches, forming a skin over the sub- 
Stratum; also on sandy beaches. 
forma natans Gomont.—Plant mass covered with water; at 
first attached to wet earth, later floating; filaments loosely en- 
tangled; floating in fresh water lagoons, rice fields, taro patches, etc. 
forma aeruginosa (Agh.) Wolle.—Plant mass dark blue-green; 
forming conspicuous patches in shallow water of rice fields, taro 
patches, and similar situations. 
L. majuscula (Dillwyn) Harvey.—Plant mass up to 3 cm. high or 
long; widely expanded; dark blue to yellowish green; filaments 
very long; epiphytic on other marine algae, in shallow waters along 
the coral reefs. 
L. Martensiana Menegh.—Plant mass caespitose, blue-green; 
occurring on twigs, etc., under dripping water, under flumes, and 
tanks, and near waterfalls in the mountains; not uncommon. 
L. perelegans Lemm.—Epiphytic; known only from Laysan 
Island, where it was collected on other marine algae. 
L. Kuetzingii var. distincta (Nordst.) Lemm.—Occurs on the 
lowlands, in ditches and shallow ponds; epiphytic on such forms as 
Pithophora and Cladophora. 
Hydrocoleus cantharidosmus (Mont.) Gomont.—Plant mass up to 
2 cm. high, caespitose, slippery, olive or dark blue-green; growing 
with other algae in shallow waters along the coral reefs and beaches. 
