720 
IX. ALGiE. 
[ Calothrix . 
1. C. scopulorum, Weber and Mohr ; — FI. N. Z. ii. 265. Filaments 
-Jg in. long, minute, erect, curved, flexuous, simple, formiug a continu- 
ous, dirty-green, velvety stratum, attenuated to the point, slimy at the base, 
indistinctly striate. — Harv. Phyc. Brit. t. 58 B. 
Mud and rocks near high-water mark, Colenso. (Widely diffused.) 
HO. OSCILLATORIA, Yaucher. 
Frond of capillary interlacing filaments floating in mucus ; filaments simple, 
continuous, presenting a curious oscillating motion under the microscope ; 
tube transversely closely striated. 
A large genus, abounding chiefly in fresh water, forming green or coloured slimy masses 
on moist rocks etc., aud a scum on ponds, etc. 
Species of this genus are no doubt as common in New Zealand as in Europe and every- 
where, but they cannot be determined except in a fresh state. Fragments of several have 
been collected by Colenso, Lyall, and others. 
111. TOLYPOTHRIX, Kuetzing. 
Frond of free capillary filaments, articulate at the base ; branches fascicled 
or radiating, not opposite. Sheaths hyaline, open at the apex. 
A considerable European freshwater genus, probably found all over the globe. 
1. T. irregularis, Berk, in FI. N. Z. ii. 265. Filaments verdigris- 
green, irregular, 2 ood ~g iss i n - diameter, compressed, sometimes constricted 
or torulose, often attenuated above and below, furnished at the base with a 
minute, hyaline, elliptic connecting joint ; rings very narrow. 
Tidal mud, amongst patches of Yaucheria , Colenso. 
112. NOSTOC, Yaucher. 
Frond gelatinous or coriaceous, dull green or brownish, amorphous, tra- 
versed by moniliform filaments, which finally break up as spores. 
Gregarious Algce, forming jelly-like masses on the damp ground, moss, rocks, and some- 
times in water, often resembling Collemas. 
1. N. verrucosum, Voucher ;—Fl. N. Z. ii. 266. Frond f-1 in. across, 
gregarious, confluent, subglobose, plaited, blackish green, at length hollow 
filaments short, curled, fragile. — Agardh, Syst. Alg. 21. 
Canterbury plains, in freshwater streams, Lyall. (Europe, etc.) 
113. ACHNANTHES, Bory. 
Frond like a little flag, rectangular, attached to a short or long stipes by 
one corner, composed of a few frustules, which separate without cohering at 
the angles. 
Very minute Algos, parasitic, like minute flags on the stems of other Algos. 
