Tin: MARINE alga: OF NEW FA'GLAXD. 143 



has novcr yet heon found with rystocarpic fruit, tlir pjt'uus brin^^ rcfmiMl to the pivs- 

 cnt suborder in consoquenco of the rosonjbhinoc of the frond to that of DumontUt. Ac- 

 conliuj; to IJornct, tlio spores in D.Jilifonnis arc borne directly on the earpojijt'nic cell, 

 whereas in the nearly related genera of ('n/j;/^/*^)/!!^' there are sterile cells between 

 the spores and the carpogenic erll. 



HALOSACCIOX, Kiitz. 

 (From (iP.f, the sea, and aoKKiov, a small sack.) 



Fronds hollow, tubular or saek-sbaped, simple or proliferously branched, 

 consisting of an internal hiyer of hirge, roundish, anguhir, colorless cells, 

 usually arranged in linear series and packed closely together by a gela- 

 tinous substance; tetraspores cruciate, immersed in the cortical layer; 

 cystocarps! 



A sniAll genus, including about ten species, of which IT. ramentaceum is common in 

 the North Atlantic, the other species being conlined to the North Pacitic and ex- 

 tending as far south as California on the east coast and Japan on the west coast. 

 The species are all coarse and somewhat cartilaginous, and are either in the form of 

 elongated obovate sacks or tubular and proliferous. The cystocarpic fruit is unknown, 

 and the genus is placed conjecturally near JJumuntia in conse<pience of the structure 

 of the frond. 



n. EA^kiENTACEUM, (L.) Ag. {R. rameivtacexun^ Xer. Am. Bor., Part 

 II, n. 29 a.— Ulva soholi/era, Fl. Dan., PI. SoG.) 



Fronds brownish i^urple, six to fourteen inches high, cylindrical-com- 

 pressed, attenuated at the base, simple or irregularly branched, more or 

 less densely beset with scattered or crowded, simple or forked, lateral 

 proliferations ; tetraspores large, spherical, cruciate ; cystocarps ? 



Var. GLADiATUM, Eaton, Trans. Conn. Acad., Vol. II, p. 347. 



Proliferations long, simple, somewhat incurved, inflated. 



On algie in deep pools and on mud-covered rocks at low-water mark. 



From Gloucester, Mass., northward ; North Atlantic and Pacific. The 



variety at Eastport. 



A characteristic species of our northern coast, occasionally found at Gloucester and 

 Incoming very common at Eastport. The fronds are very variable in shape, yet, on 

 the whole, easily recognized. The most marked form is the var. gladiatum. The 

 robustness depends a good deal on the place of growth. In exposed pools the fronds 

 are short and very densely prolifiTOUs; in sheltered harbors, like that of Eastport, the 

 1 rolifrrations grow long, and are of rather delicate texture, approaching //. micro^po- 

 rum, which hardly seems a distinct species. Kjellman, in Spet/bergens Marina kloro- 

 fylin»rande Thallophyter, mentions certain hemispherical protuberances on the fronds 

 of this species, and the same are found on our coast. As before stated, the specimen 

 of A a2}erococcn8 vompriHHus cr«'dited to Gloucester, Mass., was an error, the specimen 

 bring in reality a sterile an<l partly bleached Ilalonaccion. 



Suborder GIGARTIXE.E. 



Fronds terete, compres.sed or meinljranaceous, fleshy or cartilaginous; 

 antberidia in superficial sj^ots or sunk in small crypts; tetraspores 



