THE M.VKINi: ALG.E OF NEW ENGLAND. 75» 



INSUFFICIENTLY DESCRIBED SPECIES. 



E. LANDSiUTRCrii, llarvoy, Xit. Am. r>;)r., Vol. I, PI. 12 il. 



llalitax, X. S. 



K. HOOPERI, Harvey, 1. c, Tl. \'2 e. 



Green port, L. I. (?) 



i:. DiETZi-i-, narwy. 1. <•., p. 111. 



Cireenpoit. 



Family SPIIACELAKIE.E. 



Fromls branching', i)olysii»lionoiis, teniiiiiatin*^ in a larjjfo ai)ical cell^ 

 often with a cortex Ibrmed of densely interwoven rhizoidal lilaments; 

 friictitieatiou same as in Evtocarpccv. 



Corticating cells wanting or confined to the base of the frond. 



^pliacclaria. 



Main branches corticated tliroughout. 



Branches opposite, distichous CJuctojUeris, 



Branches whorled Cladostcpliu^i. 



SPHACELARIA, Lyngb. 



(From a^QKe/.oc, gangreue, referring to tho tips of the branches, which are black and 



shriveled when dried.) 



Fronds olive-brown, filamentous, branching j axis and branches ter- 

 minated by a hirge apical cell, from which, by transverse, longitudinal, 

 and oblique divisions, a solid frond is formed whose external surface is 

 composed of rectangular cells arranged in regular transverse bands j 

 liairs slightly developed or wanting; rhizoidal filaments few, rarel}' 

 interwoven so as to form a false cortex; unilocular and plurilocular 

 sporangia spherical or ellii)soidal, on short pedicels; non-sexual repro- 

 production by peculiarly modified branches called propagula. 



The old genns S2)hare1ana\ycis divided by Kiitzing into a nnraber of genera, and his 

 views have been adopted by many recent writers, especially in Germany. In Stypo- 

 caulon and Ilahtptcris the branches arise from lateral divisions of the apical coll itself, 

 ■while in Sphacclaria proper, ChwtopkriH and Cladostephus, tho branches arise from cells 

 below the apex. \Vhether this ditlerenct! in the apical growth can Ix? considered a 

 generic mark is not altogether certain, and there hanlly seems to be suflicient gronnd 

 for separating llalopteris from Sphactlaria, and a number of writers, among whom 

 may be named Harvey ami Le Jolis, even include Stypocaulon. CladoHtcphm is mark- 

 edly distinct; and Chwtopteris, which differs from Sphacclaria principally in the corti- 



GlRAUDiA SPilACELARioiDKS, Derb. & Sol., a common Mediterranean alga, which 

 occasionally occurs a.s far north as the Scandinavian coast, may perhaps be found ou 

 our shore. It resembles a small Spharclaria, but its growth is trichothallic, not from 

 an apical cell, and the small unih>cnlar siu)rangia cover the frond in dense j)atches. 

 Tho plurilocular sporangia resemble those of some Jktvcarpi, ami are found at the base 

 of the plant according to Areschong. 



