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 /u,, 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 Ilca fnlves- 

 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 Kutzing, 1856, p. u, 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 p. diam., in no definite order ; thick- 

 ness of membrane, 15-20/1.. 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 coast appears to be on the 

 surface of shaded, steep or vertical cliffs, especially 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. Habit 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 ; much twisted and con- 

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

 Greenland, Mass., Wash. Europe. 



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

 Agardh, 1882, p. 131, PL IV, fig. 109; Harvey, 1846-51, PI. 

 CUV ; P. B.-A., No. 464; UlvaJEnteromorpha var. intestinalis 



