THE MAKIXE ALG.E OF NEW ENGLAND. 77 



angles, aud froquently opposito. In ^. cinhosn tho sporangia arc goncrally Hcattrrod 

 (»n the secondary branches, while iu S. radicans they are often clnstered on tho main 

 hrauches. In both cases tho pedicels are usually one-celled. In both species tho 

 propagnla are so variable in t»utline that they cannot be describeil in lew words, but 

 those ot'.S. cirrhosa are more robust than those of S. radi<aiin. 



Sph<urlari<i (htlaho, Kt'insth, Contrib. a<l Alg. et Fung., p. 22, IM. :U), ilrscribt'd from 

 thf coast of Labiatlor, does not corrcsptjud to any form known to us from New England. 



CmETOPTEKIS, Kiitz. 



(From x^^'^) a hair, and -rfp^f, a ftrn.) 



Frouils olive-brown, filamentous, branching:; branches opposite, dis- 

 tichous, apical fjrowth as in S2)hacclaria ; rhizoidal filaments very numer- 

 ous, densely interwoven, so as to form a false cortex ; plurilocular spor- 

 angia borne on the branches, shortly pedicillate, unilocular sporangia 

 *' globose on the tips of short special filaments" (Areschoug). 



A genus founded on the old Sphacelaria })Jiimosa of Lyngbye. It differs from Spha- 

 celarla in the lalse cortication of the main branches by the interlacing of rhizoidal 

 filaments, and from CIa(lo>iti'phus by the opposite, not whorlcd l)rauches. The genus 

 does not rest on a tu'm basis, for it occasionally happens in some of the species oi Spha- 

 ceJoria that the rhizoidal tilaments form a rudimentary cortex. Cha^toptcria squamulosa, 

 Kiitz., is made by Geyler the type of a new genus, rhhiocaulon. 



C. PLUMOSA, (Lyngb.) Kiitz. {Sphacelaria plumosa, Lyngb., Phyc. 

 Brit., PI. Sl.^Chcet02)teris phimosa, Kiitz., Phyc. Gen., p. 293; Tab. Phyc, 

 Vol. G, PI. 0, Fig. 1 ; Areschoug, Obser. Phyc, l*art III, PI. 2, Figs. 1 

 and 5.) 



Fronds two to six inches long, tufted, rigid, attached by a small disk, 

 main branches sparingly branched, secondary branches plumose; pluri- 

 locular sporangia numerous, secund on the upper side of short special 

 branches, shortly stipitate, elliptical in outline ; unilocular sporangia 

 jrlobose, terminal on short branches. (Areschoug, 1. c) 



l*rince Edward's Island, Mrs. JJavis^ and northward; Xorthern Eu- 

 rope. 



A beautiful specits, common iu Northern Europe and Greenland, but not yet found 

 farther south than Prince Edward's Islaurl on tho American coast. It may, however, 

 be exjiected at Eastport aud our northern border. 



CLADOSTEPUUS, Ag. 



(From \/. cV-f, a branch, and crrt^of, a crown.) 



Fronds olive-brown, branching, secondary branches (leaves) whorled, 

 apical growth as in Sphacelaria ; main stems densely corticated by 

 gi'owth of rhizoidal filaments, secondary branches (leaves) naked, hairs 

 borne iu tufts just below the apex of branches; unilocular and pluri- 

 locular .sporangia on special branches (leaves), stipitate. 



