168 MINNESOTA IJOTANICAL STUDIES. 



one side of the dichotomy appears sHghtly lateral upon the other), 

 once or twice about half way to the summit, and abruptly several 

 times at the summit, forming a small compact corymb. All the 

 proximal cells, and in old parts of the frond the median cells also. 

 give off rhizoidal-like branches about 5 mic. in diameter, which 

 grow down into the central part of the frond and form the small 

 filaments of that region. Antheridia are of the usual type found 

 in species of En-Liagora. Nearly all the antheridial filaments are 

 borne on the penultimate cells of the cortical filaments. Cystocarps 

 appear to be very rare. \o mature ones have been seen, but a few 

 young ones in the Tahitian material have the ordinary structure of 

 the genus. 



Liagora sub-paniculata sp. nov. 



PLATE XXIV. FIG. 7. 



Fronde irregulariter dichotoma per ramis binis inaequaliter 

 crescendis quasi paniculata ad 10 cm. alta, 1-1.25 mm. lata ad apices 

 conicos obtusos parum attenuata, paene ad apices ramorum calcis 

 incrustatione primo pulverulenta deinde continua annulata rugosa 

 instructa ; strato axile moUi elastico-gelatinoso filis cylindraceis et 

 latioribus et angustioribus laxe intertextis composita in partibus 

 vetustioribus frondis quam semidiametro frondis latiore. ramulis 

 corticalibus laxe tecto qui inferne cellulis cylindraceis superne elon- 

 gatis instructi et parce furcati capitula corymbosa cellulorum ovali- 

 um sen globosorum subiter ferunt : C}stocarpiis conspicuiis ut punc- 

 tis subprominentibus decalcaratis, magnis parce involucratis. 



North of Hotel, Waianae, Oahu. ^lav 26, 1900. (J. E. T. 

 863. 864); Waianae, Oahu. June 12. 1900. (J. E. T. 1564 B); 

 Kauai, June 23, 1902. 18-41 fathoms. S. For. Co. R. (U. S. 

 Fish Com. 4023 A.) 



The frond is dichotomously branched, but as one of the branch- 

 es of. a dichotomy is usually retarded in its growth it comes to have 

 a subpinnate, paniculate aspect. The incrustation of lime varies 

 considerably, being at first pulverulent and remaining so in some 

 small specimens, but in others and in all large specimens becoming 

 continuous and roughly rugose. In outward appearance agreeing 

 closely with Liagora rugosa, it has, however, the internal structure 

 of the sub-genus Eu-Liagora. The large medullary filaments are 

 numerous, thick-walled, very prominent in a surface view of a 

 slightly crushed branch, cylindrical or somewhat larger toward the 



