300 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



naceous cystocarp, and the histological characters are mainly those of 

 Gymnogongrus. The very gelatinous nature of the cell-walls, however, is 

 quite different from those of all known species of the genus." Setchell and 

 Gardner. 



Gymnogongrus sinicola sp. nov. 

 Plate 71, Fig. 2 (lower left) 



Frondes 4-6 cm. altae, e disco simplici orientes, inferne teretes, superne leviter 

 compressae, 2-3 mm. diam., firmae, solidae, carnosae, maxime in planitie una, di- 

 chotomo-ramosae ; segmentis curtis, vulgo circa 5 mm. longis; apicibus rotundatis; 

 structura generis. 



Fronds 4-6 cm. high, from a simple holdfast, terete below, to slightly 

 compressed above, 2-3 mm. broad, of a firm, turgid, fleshy texture, di- 

 chotomously branched, mainly in one plane ; segments short, mostly about 

 5 mm., and slightly broader above than below; apices blunt, rounded; 

 cross section showing a very large medulla of large, thin-walled, isodia- 

 metric cells to 200 ju, diam., grading toward the periphery into the sub- 

 cortex of small cells 40 ju, to 18-20 \x'y cortex of a single palisade layer of 

 anticlinally arranged cells measuring 8-16 /x; reproduction unknown. 



Type: D. 447, lower littoral rocks, San Esteban Island, Feb. 5, 

 1940. Herb. AHF no. 40. 



D. 484, on reef rocks, Catalina Bay, outside Guaymas Harbor, Feb. ; 

 D. 213, on rocky shore, Puerto Refugio, Jan.; D. 122, reef rocks, 

 Turner's Island, Jan. 



This species may be distinguished by its rigid, thick, fleshy, usually 

 terete fronds. Though all our material is sterile, the habit and structure 

 seem to justify its arrangement under Gymnogongrus. 



Gymnogongrus Hancockii sp. nov. 

 Plate 71, Fig. 2 (upper left) 



Frondes usque ad 2 cm. aitae, caespitosae, copiose-Iate-divaricato-dichotomo- 

 ramosae; segmentis circa 300 M- crassis, plerumque 0.8-1 mm. latis, inferne angusti- 

 oribus, ad apicem curtioribus, plerumque inferne 2-3 mm. longis; apicibus bifidis 

 aut 3-4 digitatis; cystocarpiis circa 450 jx diam., dimidio immersis, carpostomia 

 pauca praebentibus. 



Plants to 2 cm. high, of abundant, narrow, widely divaricate, dichoto- 

 mous branches, caespitose, forming a small, rounded clump on rocks, of a 

 soft, delicate texture when fresh; segments, about 300 ju, thick, mostly 

 .8-1 mm. wide, narrower below; distance between dichotomies succes- 

 sively shorter toward apices, mostly 2-3 mm. below; apices bifid, or 3-4 



