THE ALGAE OF BERMUDA. 105 



fication etc. It often forms dense mats, attached to the substratum 

 by frequent rhizoids; at other times only the bases of the filaments 

 are attached, the upper part forming loose tufts. Cystocarps and 

 antheridia are unknown, tetraspores seldom occur, but were found in 

 plants collected at Smith's Bay, Nov., Hervey. Short much branched 

 forms might be mistaken for Gelidium, but on sectioning, the absence 

 of the fine descending rhizoidal filaments of the internal layer is a 

 sufficient distinction. Gelidiopsis gracilis Vickers, Algues de la 

 Barbade, No. 126, seems to be this species; we have compared her 

 specimen with an authentic specimen of W. setacca from the Harvey 

 herbarium, and both with Bermuda material, and can find no differ- 

 ences . 



FAMILY GIGARTINACEAE. 

 GIGARTINA Stackhouse. 



G. ACICULARIS (\Vulf.) Lamouroux, 1813, p. 48; Harvey, 1846-51, 

 PL CIV; P. B.-A., No. 1884; Fucus acicularis Wulfen, 1803, p. 63. 

 Kemp, June, as G. Tecdii; Burchell's Cove, Feb., Gravelly Bay, 

 April, Tucker's Town, March, May, Dec., Hervey; pool near Moore's 

 calabash tree, April, Collins. Forming a somewhat matted coating 

 on floors of caves or on bottoms of pools. 



KALLYMENIA J. G. Agardh. 



K. PERFORATA J. G. Agardh, 1871, p. 9; 1876, p. 219. Washed 

 ashore, Cooper's Island, Feb., Farlow. There is much variability 

 as to the amount of perforation; some fronds 6-7 cm. diam. are quite 

 imperforate, while others, no larger, are little more than a network. 



FAMILY RHODOPHYLLIDACEAE. 

 CATENELLA Greville. 



C. OPUNTIA (Good. & Woodw.) Grev. var. PINNATA (Harv.) J. G. 

 Agardh, 1876, p. 588; Alg. Am.-Bor. Exsicc., No. 149; P. B.-A., No. 

 1885; C. innnata Harvey, 1853, p. 201, PI. XXIX. B. Common 

 between tide marks in quiet waters all about the islands, on ground, 



