y. CRYPTONEMIACEiE. 171 



smaller toward the surface, each cell surrounded by a net-work of anastomosing 

 cellules ; cortical stratum formed of vertical, moniliform filaments. Conceptacles 

 immersed in the disc or margin, sub-prominent, roundish, containing within a 

 closed pericarp (formed from the cortical layer) a compound nucleus consistino- of 

 several nucleoli or masses of minute spores, separated by a net-work of slender 

 fibres. Tetraspores immersed in the frond, scattered, cruciate. 



A genus of splendidly-coloured Algaj, chiefly natives of the southern hemisphere. 

 Fronds blood-red, or scarlet-lake, flat, nerveless, dichotomous or somewhat palmate, 

 the lacinite broader upwards, lobed at the extremity, and frequently fimbriate 

 along the margin. The internal structure of the frond is very peculiar. The 

 medullary portion consists of two or more, sometimes of many, rows of large, empty 

 cells separated by narrow interspaces, through which a delicate net-work of cob- 

 webby filaments permeates. The cortical layer is formed of more or less evolved 

 moniliform, vertical, coloured filaments, set in firm transparent gelatine. Formerly 

 these plants were included in Bhodymenia, of which genus they have externally the 

 habit, but from which they abundantly difiier in the structure of the frond and of 

 the sporiferous-nucleus. 



1. Callophyllis laciniata, Kiitz. ; frond sub-cartilaginous, bright red, palmate or 

 flabelliform, cleft into numerous, broad, wedge-shaped segments which are again 

 divided dichotomously ; apices obtuse ; the margin of fertile specimens curled and 

 fringed with minute ciliary processes, in which the conceptacles are lodged. /. Ag. 

 Sp. Alg. 2, p. 299. Kiitz. Sp. Alg. p. 744. Rhodymenia laciniata, Grev. — Hwv. 

 Phyc. Brit. t. 121. F^icus laciniatus, Turn. Hist. 69- -£'• Pot. t. IOC8. 



Hab. Pacific coast, 3Ir. Menzies ! 1788. California, Beechey. Atlantic coast, at 

 Cape Henlopen, Miss Morris, (v. v.) 



Apparently very rare on the American coast. I have as yet only seen a solitary, 

 small, but unmistakable specimen from the Atlantic side of the Continent ; and it 

 is diflicult to conceive that so conspicuous a plant should be overlooked by collec 

 tors were it not extremely rare. 



VII. KALLYMENIA. J. Ag. 



Frond carnoso-membranaceous, flat, irregularly cleft or divided into indefinitely- 

 circumscribed lobes, composed of three strata of cells ; the medullary stratum of 

 densely interwoven, branching and anastomosing articulated filaments ; the inter- 



z 2 



