1918] MAacCAUGHEY—HAWAIIAN ALGAE 131 
Oocystis Naegeli A. Br.—Has been collected in swamps on the 
middle slopes of Mauna Kea, Hawaii. 
Scenedesmus quadricauda (Turp.) Breb.—In pools and reservoirs 
on all the islands; var. oahuensis Lemm. has been collected on 
the lowlands of Oahu. 
CHARACIACEAE 
Characium ensiforme Herm.—Has been reported from the 
swamps on the slopes of Mauna Kea. 
C. minutum A. Br.—In wet caverns and other moist habitats. 
C. groenlandicum Richter.—Found growing on crustaceans in 
fishponds on the island of Molokai. 
HALOSPHAERACEAE 
Halos phaera viridis var. gracilis Lemm.—Collected in plankton 
between Hawaii and Laysan. 
HYDRODICTYACEAE 
Pediastrum integrum var. Braunianum (Grun.) Nordst.—Pools 
and streams. 
P. Boryanum (Turp.) Menegh.—Pools and streams. 
P. duplex var. clathratum A. Br.—Pools and streams; var. 
reticulatum Lagerh. occurs in the same habitats. 
P. tetras (Ehrenb.) Ralf.—Pools and streams. 
P. bidentulum var. ornatum Nordst.—Stagnant shallow waters. 
‘Hydrodictyon reticulatum (L.) Lagerh.—Plentiful in rice fields, 
taro patches, and other shallow waters; it is called pala-wai by the 
native Hawaiians, and sometimes used by them for food. The 
native name is also applied to several other green fresh water algae. 
OPHIOCYTIACEAE 
Ophiocytium gracilipes A. Br.—A free swimming form, in shal- 
low waters, and also in wet caves at higher levels. 
CONFERVACEAE 
Conferva bombycina var. minor Wille.—Cosmopolitan. 
C. sandwicensis Agh.—Endemic; in rice fields, pools, and 
streams; filaments very fine and silky. 
