Butters: liagora and galaxaura. 179 



Section IV. Eugalaxaura (Dcsne) Kjellman. 



Galaxaura fragilis Lamk. et aiict. in Kjellman. Om Floride- 

 Slag^et. Galaxaura. 60. 1900. Tilden. American Algae. Cent. V. 

 no. 415. 1901. (G. adriatica.) 



Frond corymbose, very smooth, fragile, almost inconspicuous- 

 ly annulately rugose, pale, with white apices, about equally thick 

 throughout, equally dichotomous, at length decompound with pro- 

 liferations orrowino^ out from the summits of broken branches, axils 

 open, internodes obconical or cylindraceous, obconical, with length 

 four times the diameter, below 1.7 mm. thick; assimilatory fila- 

 ments not joined when the lime is dissolved out, composed of cells 

 with thin walls, the inner round or with a width greater than the 

 height, commonly 36-42 mic. wide, the terminal subequal, semiglo- 

 bose, 18-20 mic. wide. Attached to rocks on sandy beach. 

 Waianae, Oahu. May 22, 1900. (J. E. T. 827.) 

 Kealia beach, Kauai. July 25, 1900. (J. E. T. 1178 A.) 

 The cortical cells are somewhat smaller than above. The in- 

 ner cells average about 30 mic, the outer about 18 mic. According 

 to Kjellman (in letter) this material, if not identical with the above 

 species, is very closely allied to it. 



Det. by Kjellman. 



Galaxaura schimperi Dcsne. Sur les Corallines. 116. 1842. 

 Kjellman. Om Floride-Slagtet. Galaxaura. 61. 1900. 



Frond loosely corymbose or almost semi-globose, very smooth, 

 somewhat firm, above densely annulately elevated rugose, yellowish, 

 thickened towards the apex, loosely equally furcate and decompound 

 with proliferations from the apices, and sometimes from the genicu- 

 li ; axils wide ; internodes distended, elongated obconical. the lower 

 2 mm. wide and 1.5-3 times as long, the upper more elongated, up 

 to six times the diameter ; filaments of the assimilatory tract not 

 connected when the lime is removed, consisting of cells with thin 

 walls, the interior obovoid or ovoid, their height exceeding their 

 width, scarcely exceeding 30 mic. in diameter, the uppermost often 

 obconical, of various size, 8-12 mic. wide. 



Hanalei, Kauai. July 25, 1900. (J. E. T. 1239.) 



