THE MARIXi: ALG.E OF NEW ENGLAND. 109 



to retain the namo TreHtepithVui which was oiico adoptiMl by Harvey, aiul at a hiter 

 date also hy Prinjrsheim, siueo it siifflciontly indicatos that the species in «|uestioii 

 shouhl be kept ilistinet from CaHithamiiioti, and at the sain«' time does not assiiinr tli«« 

 existence of cystocarps like those described by Thnret and Hornet in C. corymhi/cra. 



T. viRGATULA,(lIarv.). {CaUithamnion virgatulum. Hiirv., IMiyc lirit., 

 VI .113; Xer. Am. Bor., Part IT, p. 243.) PI. X, Tig. 3. 



Fronds minute, tufted, brandies erect, straight, alternate or secund ; 

 spores sessile or on short stalks, borne either singly or in twos and 

 threes alon;;' tin* branches. 



Var. SEClTNDATA. {CaUithamnion lururians^ Xer. Am. l>()r. — (\ secun- 

 (Jafitm, Lyn^di.) 



Branches patent, with attenuated, naked, .secund, .secondary branches. 



On Ccramium, Liminaria stems, and other algic. The variety espe- 

 cially on Zostcra. 



Common in Long Island Sound ; Gloucester, Mass. ; Peak's I.sland, 

 Maine. 



A common species fonnd in snniiner on dilTerent alg;r. On the filamentons .species 

 it forms small tnfts, and on Zostcra it frin<j:es the margins of the leaves with a fine 

 jdnsh scarcely more than a qnarter or half an inch high. The synonymy of the .species 

 is very complicated, it having been confnsed with the next bj^ some writers. The 

 variety is common on Zostcra, and is usnally fonnd in American herbaria bearing the 

 name of C. huurians. There is little donbt that it is the C. Uixurians of the Nereis Am. 

 B«»r., but whether it is the species described under that uame by Agardh is doubtful. 



T. Daviesit, narv. {Conferva Uavi^sii, Engl. Bot., PI. 2320.— Ca?- 

 lifhamnion Bariesii^ Phyc. Brit., PI. 314.) 



Fronds minute, tufted, brandies scattered, patent, bearing in theu^ 

 axils fasciculated ramuli, at whose tips are borne the spores. 



On Bhodymcnia. 



Gloucester, Mass. 



The limits of the species are not well marked. The extreme form is found in C. 

 { j}i o reset- »s, Thnret, kept as a distinct species by most writers, in wJiicli the branches 

 are few, long, and given oti'at wide angles, and the spores borne in dense corymbs or 

 heads in the axils. This form has been fonnd on Cifstoclonittm 2)t(r2)i(rasccns at Gay 

 Head. 



Among the genera whose relations to the Floridea must bo considered doubtful are 

 Choreocolax and PseiidohlastCy^h'Hcrihod ]»y Rcinsch in Contribntioncs ad Algologiam ct 

 Fungoloyutm. Of the last-name<l genus a single species, of the former five species, are 

 attribnte4l to the eastern coast of America. The species of Choreocolax consist merely 

 of rose-colored filaments, which are i>arasitic in the fronds of ditTerent Floridca\ upon 

 the surface of which they produce irregularly swollen masses, composed in part of the 

 threads of the Choreocolax an«l in i»art of the distorted tissues of the host-plant. The 

 specie* of PseiuJoblastc consist of aggregations of cells arnmged in longitudinal scries, 

 which form hemispherical masses on the surface of different Floridea: In neither genus 

 is any form of reproduction known, and, for this reason, the descriptions of Rcinsch 

 must Iw n*gardcd as inadccinate, since it by no means follows that plants cf)nsisting of 

 rose-colored filaments belong to t he Floridea: One often finds on our coast Floridea; whoso 



