CALOTRICHE^E. 



Isactis plana. Thur. Notes Alg. n., p. 165. 



Frond crnstaceous, plane, suborbicular or confluent, from 1 in. 

 to 2 feet, dull green, darker in the centre, lubricous, gelatinous. 

 Trichonies erect, parallel, sheaths hyaline. 



SIZE. Trichomes -008 mm. diani. 



Born, and Thur. Notes Algol, ii., p. 165, t. 40, figs. 1-4. 



Eivularia plana, Harv. Man. 152. 



Dasyactis plana, Kutz. Tab. Phyc. ii., t. 73, f. 1. 



Mastigonema plana, Eab. Alg. Eur. ii., 226. 



Parasitic on EnteromorpTia and other Alga3, chiefly in salt or 

 brackish water, or on rocks by the sea. 



^ marine, but rarely on Enteromorpha, in estuaries and brackish 



ditches. 



Plate CXir.fig. 1. Trichonies X 350 diam. after Bornet and Thuret. 



GENUS 116. GLOIOTRICHIA. Ay. (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. Sol. 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 'Ol'-l^ mm. at base, with sheath ; '03 mm. 

 diam. Spores '013 mm., and upwards, diam., several times 

 as long. 



Eivularia gigantea, Fischer Nost., fig. 6. 



Rivularia angulosa, Kutz. Tab. Phyc. ii., t. 67, f. 2. Eng. 

 Bot. t. 2551. Hass. Alg. 264, t. 60, f. 1-4. Eng. Fl. v., 394. 

 Harv. Man. 153. 



Gloiotrichia angulosa, J. Ag. Alg. Med. 8. Rabh. Alg. Eur. 

 i., 201. Jenner, Tunb. Wells, 190. 



Gloiotrichia Boryana, Kutz. Tab. Phyc. ii., t. 68, f. 2. Rabh. 

 Alg. Eur. i., 201. " Ralfs. Alg. Exs., 21. 



Gloiotrichia gigantea, Rabh. Alg. Eur. ii., 201. 



Eivularia pruniformis, Purt. Midi. Fl. ii., 617. 



Eivularia natans, Gray Arr. i., 285. 



Tremella utriculata, Huds. Ang. 564. 



In ditches, ponds, &c. 



Plate CXVl. Jig. 1. Trichonies x 400 diam. a, homogones of same 

 X 400 diam. 



2 R 



