CALOTRICHES, 281 
Isactis plana. Thur. Notes Alg.11., p. 165. 
Frond crustaceous, plane, suborbicular or confluent, from 1 in. 
to 2 feet, dull green, darker in the centre, lubricous, gelatinous. 
Trichomes erect, parallel, sheaths hyaline. 
Size. Trichomes ‘008 mm. diam. 
Born. and Thur. Notes Algol. ii., p. 165, t. 40, figs. 1-4. 
Kivularia plana, Harv. Man. 152. 
Dasyactis plana, Kutz, Tab. Phye. ii., t. 78, f. 1. 
Mastigonema plana, Rab. Alg. Eur. ii., 226. 
Parasitic on Enteromorpha and other Alge, chiefly in salt or 
brackish water, or on rocks by the sea. 
Pred marine, but rarely on Enteromorpha, in estuaries and brackish 
itches, 
Plate CXIV. fig.1. Trichomes x 350 diam.—after Bornet and Thuret. 
GENus 116. GLOIOTRICHIA. dg. (1842.) 
Trichomes pseudo-ramose, distinctly vaginate, sheaths broad, 
often saccate at the base, transversely plicate. Spores originat- 
ing in the lower part of the trichome. 
Gloiotrichia natans. Thur. Ann. Sci. Nat.175, 377. 
Globose or angular, tuberculose, variable in size and form, 
green, becoming brownish, trichomes straight, torulose, flexuous 
and hyaline above ; lower joints more or less compressed. Sheath 
broad, here and there constricted, colourless or yellowish. Spores 
oblong, cylindrical, heterocysts subglobose. 
Size. Trichomes*01:-12 mm. at base, with sheath ;-03 mm. 
diam. Spores ‘018 mm., and upwards, diam., several times 
.as long. 
Rivularia gigantea, Fischer Nost., fig. 6. 
Rivularia angulosa, Kutz. Tab. Phye. ii., t. 67, f.2, Eng, 
Bot. t. 2551. Hass, Alg. 264, t. 60, f. 1-4. Eng. Fl. v., 394. 
Harv. Man. 158. : 
Gloiotrichia angulosa, J. Ag. Alg. Med. 8, Rabh, Alg. Eur. 
i., 201. Jenner, Tunb. Wells, 190. 
Gloiotrichia Boryana, Kutz. Tab. Phye. ii, t. 68, £2. Rabh. 
Alg. Eur.i., 201. Ralfs. Alg. Exs., 21. 
Gloiotrichia gigantea, Rabh, Alg. Eur. ii., 201. 
Rivularia pruniformis, Purt. Midl. FL. ii., 617. 
Rivularia natans, Gray Arr. i., 285. 
Tremella utriculata, Huds, Ang. 564. 
In ditches, ponds, &c. 
Plate CXVI. fig. 1. Trichomes x 400 diam. a, homogones of same 
X 400 diam. 
2k 
