204 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



and its habit is dissimilar ; from both these species it differs in 

 having a thicker wall between the cells. 



16. E. FASCIA Postels and Ruprecht, 1840, p. 21 ; Wittr. 

 and Nordst., Alg. Exsicc., No. 1052. Frond elongate, tubular- 

 compressed, from a slender stipe ; sparingly branched ; cells 

 4-6X6-8 /A, roundish angular, in no apparent order, often -con- 

 taining 2-4 daughter cells. Behring Sea. 



In the form of the frond not unlike E. intestinalis,, but with 

 a different arrangement of cells, somewhat recalling Ilea fulves- 

 cens. The latter, however, is much softer and more gelatinous, 

 and the cells are arranged in longitudinal series, and more sym'- 

 metrical in all respects. The characteristic arrangement of 

 cells is not always distinct, and in its absence the species is dis- 

 tinguished from E. intestinalis chiefly by the smaller cells. Can 

 hardly be considered a well established species. 



17. E. MICROCOCCA Kiitzing, 1856, p. n, PI. XXX, fig. 2 ; 

 P. B.-A., No. 66. Fronds 1-5 cm. long, 1-5 mm. wide, tubular 

 or compressed, simple or slightly proliferous, much curled and 

 twisted ; cells angular, 4-5 ^ diam., in no definite order; thick- 

 ness of membrane, 15-20 /x. Greenland to Mass. ; Alaska to 

 Mexico. Europe. 



The smallness of its cells distinguishes it from all our species 

 but E. minima, in which the dimensions are only slightly 

 larger ; but the latter species has a very thin and delicate 

 membrane, while in E. micrococca it is relatively quite thick, 

 the thickening being specially pronounced on the inner side ; 

 this gives it a coarser feeling to the touch than E. minima. Its 

 favorite habitat on the New England coa-t appears to be on the 

 surface of shaded, steep or vertical cliffs, < specially where the 

 flow or drip of fresh water keeps it continually moist. 



Forma BULLOSA Collins, P. B.-A., No. 1067. Fronds large, 

 irregularly inflated, to 5 cm. diam. Hal>it of E. intestinalis 

 forma maxima, but structure of E. micrococca. Cal. 



Forma SUBSALSA Kjellman, 1883, p. 292, PI. XXXI, figs. 

 1-3; P. B.-A., Nos. 467, 1068. Rachis flattened, with numer- 

 ous patent branches from the edges ; innch twisted and con- 

 torted, color dark green ; growing in lagoons and marshes. 

 Greenland, Mass., Wash. Europe. 



18. E. INTESTINALIS (L.) Grevlle, 1830, p. 179; J. G. 

 Aga dh, 1882, p. 131, PI. IV, fig. 109; Harvev, 1846-51, PI. 

 CLIV ; P. B.-A., No. 464; Ulva Enteromorpha var. intestinalis 



