THE MAKIXE ALG.E OF NEW ENGLAND. 129 



Wo have only iiuotid \ho localities •jiveii l»y IFarvoy, althoti;^!* ^^■<' Ijhvo foiiiul what 

 we take to bo C. coryiHl)0.'<iim at Xowport, Wood's IIoll, ami in oon.sitUraVih' altundai^co 

 at Nahaut, ahvays growinj^ on /osttra. An oxaiuination of llio dilVoront pnblishrdox- 

 siccatio of Euroi>oan writers would lead one to think that several dilferent species had 

 been included under the name of C. vorymboaum. One might doubt whether the form 

 of Crouan, No. i:il), aiul Areschoug, No. lo, belong to the samo species. At Nahant the 

 same form occurs as that distributed by French al^^ologists. 



C. DiETZi.5^, Hooper. 



" Fronds capillary, pellucitlly-articulate nearly to the base, the lower 

 part percurrent, ilistiebously-pinnate, stem veiny, branches alternate, 

 simple, set at each node with short, alternate, subsimple or pinnato- 

 dit'hotomoiis plumnles, and often terminated by a dense fascicle of 

 ramnli, rachides zi<,^zag; articnlatious of the stem six or eight times, 

 of the rachides three or four times, of the ramuli eight or ten times as 

 long as broad ; apices subattenuate, obtuse, or subacute ; tetraspores 

 elliptical, tripartite, solitary on the uppermost ramuli.'' (Xcr. Am. Bor., 

 Part II, p. 2'3(j.) 



Green port, Mrs. Diet,:. 



Only known through the description given by Harvey in the Nereis. Harvey states 

 that it is related to C. corymbosum and C. versicolor. The specimens referred to Wood's 

 Holl in Proc. Am. Acad., 1875, p. 37C, were probably incorrectly determined. 



Subgenus SEIROSPORA, Harv. 



Fronds erect, main branches corticated ; antheridia in tufts on the 

 outer side of short branches ; tetraspores tripartite ; bispores and seiro- 

 -pores present 5 cystocarps destitute of enveloping jelly. 



C. SEIROSPERMUM, Griff. (Seirospora GriffithsianOj narv., Phyc. Brit., 

 PI. 21. — PhUbothamnion seirospermum^ Kiitz. — C versicolor^ var. seiro- 

 spermum, Ilarv., in Hooker's Journ. Bot. j Paeilothammon seirospermum^ 

 Xa-g.) 



Fronds dia'cious, capillar^', two to six inches high, pyramidal in out- 

 line, main axis percurrent, pinnate with alternate, undivided, lateral, 

 branches, which bear secondary branches beset with delicate, erect, 

 dichotomo-multified, corymbose branches, main branches corticated, 

 .smaller branches monosiphonous and byssoid ; antheridia in tufts on 

 the outride of short branchlets ; tetraspores tripartite, sessile on the 

 upper branchlets, sometimes replaced by bispores j seirospores oval, in 

 moniliform tufts at the ends of the branches; cystocaqis composed of 



idiating chains of spores without gelatinous envelope (Bornet.) 



On Zosfera, shells, and stones below low-water mark. 



Common throughout Long Island Sound ; Salem, Mass., JIarvcy. 



