MARINE ALGM OF BEAUFORT, N. C. 491 



The doubt expressed by De Toni (1. c.) concerning the placing of this species in this genus appar- 

 ently based on the lack of knowledge concerning the method of division of the tetrasporangia, seems 

 removed by the observation of the author that these divide cruciately, as is characteristic for the genus. 



This is the northern known limit of the species and of the genus. 



3. Chrysymenia uvaria (Linnaeus) J. Agardh. PI. CIV, fig. i. 



Fucus crvarius, Linnaeus, 1765, Tom. 3, p. 714. 

 Chrysymenia uvaria. J. Agardh, 1842, p. 106. 

 Chrysymenia uvaria, Harvey, 1853, p. 191, pi. ao B. 

 Chrysymenia uvaria, De Toni, 1900, p. 543. 

 A. A. B. Ex. No. 150. 

 P. B.-A. Nos. z8g. 1933. 



Frond 2.5 to 22 cm. tall, consisting of a solid, terete, rigid, dichotomous, stemlike portion 0.5 to 

 i mm. in diameter, naked below, bearing numerous small, hollow, obovate, bladderlike lateral branches 

 on short stalks above; several fronds arising from a common disklike attachment; tetrasporangia and 

 cystocarps borne on the vesicular lateral branches; tetrasporangia immersed in the cortical layer, tri- 

 angularly divided; cystocarps not abundant in any branch, not very prominent; texture of stemlike 

 portion cartilaginous, of the vesicular lateral branches gelatinous-membranaceous; color rose. 



Florida; West Indies; Bermuda; Canary Islands; Mediterranean and adjoining regions; Hawaii. 



Occasional on Bogue Beach, Beaufort, N. C., summer and autumn, fairly abundant on coral reef 

 offshore May, 1907, August, 1914, and July to August, 1915. 



'Ehis is the northern known limit of the species and of the genus on our coast. 



Genus 4. Lomentaria Lyngbye. 



Lomentaria, Lyngbye, 1819, p. 101 

 Chylocladia, De Toni, 1900, p. 572- 



Frond terete or slightly flattened, hollow-tubular throughout, sometimes segmented 

 by constrictions, branching various, mostly lateral ; structure cellular, central axis lack- 

 ing, thallus wall usually rather thin, composed of three layers, a loose layer of elongated 

 branched filaments bordering the internal tube and sometimes scatteringly traversing 

 this, a single middle layer of large cells, and an outer layer composed of more or less 

 numerous small cortical cells; tetrasporangia borne on slightly dilated branchlets, in 

 cavities formed by the depression of the thallus wall, protruding into the internal cavity, 

 scattered or sometimes joined into groups, triangularly divided; antheridia borne at the 

 ends of short, cellular filaments arising from the cortical cells, forming superficial sori; 

 cystocarps scattered over the frond, rather prominent, globose or subconical, opening 

 by an apical pore, fruiting cavity usually lacking a filamentous network or sometimes 

 with a trace of this ; gonimoblast arising from the base of the cavity, composed of several 

 successively formed lobes, bearing numerous oblong or obovate carpospores from the 

 outer segments of branched fruiting filaments, at first arranged radiately, at length 

 conglobate without conspicuous order,, usually inclosed by a gelatinous covering, pericarp 

 connected to base of the cystocarp by filamentous strands separating the groups of spores. 



About 15 species, in warm and temperate seas. 



KEY TO SPECIES. 



Frond rather terete , branching irregular, often secund, branches slender, often recurved 



i . L. uncinata (p. 492 ) . 



Frond somewhat flattened, branching regular, distichous, branches compact, not recurved 



2. L. rosea (p. 492). 



