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REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 77
angles, and frequently opposite. In S. cirrhosa the sporangia are generally scattered on the secondary
branches, while in S. radicans they are often clustered on the main branches. In both cases the pedicels
are usually one-celled. In both species the propagula are so variable in outline that they cannot be
described in few words, but those of S. cirrhosa are more robust than those of S. radicans.
Sphacelaria dedalea, Reinsch, Contrib. ad Alg. et Fung., p. 22, Pl. 30, described from the coast of
Labrador, does not correspond to any form known to us from New England.
CHÆTOPTERIS, Kütz.
(From χαιτη [chaite], a hair, and πτερις [pteris], a fern.)
Fronds olive-brown, filamentous, branching; branches opposite, distichous, apical
growth as in Sphacelaria; rhizoidal filaments very numerous, densely interwoven, so
as to form a false cortex; plurilocular sporangia borne on the branches, shortly
pedicillate, unilocular sporangia “ globose on the tips of short special filaments”
(Areschoug).
A genus founded on the old Sphacelaria plumosa of Lyngbye. It differs from Sphacelaria in the false
cortication of the main branches by the interlacing of rhizoidal filaments, and from Cladostephus by the
opposite, not whorled branches. The genus does not rest on a firm basis, for it occasionally happens in
some of the species of Sphaceleria that the rhizoidal filaments form a rudimentary cortex. Chætopteris
squamulosa, Kütz., is made by Geyler the type of a new genus, Phloiocaulon.
C. PLUMOSA, (Lyngb.) Kütz. (Sphacelaria plumosa, Lyngb., Phyc. Brit., Pl. 87.—
Chætopteris plumosa, Kütz., Phyc. Gen., p. 293; Tab. Phyc., Vol. 6, Pl. 6, Fig. 1;
Areschoug, Obser. Phyc., Part III, Pl. 2, Figs. 4 and 5.)
Fronds two to six inches long, tufted, rigid, attached by a small disk, main branches
sparingly branched, secondary branches plumose; plurilocular sporangia numerous,
secund on the upper side of short special branches, shortly stipitate, elliptical in
outline; unilocular sporangia globose, terminal on short branches. (Areschoug, l. c.)
Prince Edward’s Island, Mrs. Davis, and northward; Northern Europe.
A beautiful species, common in Northern Europe and Greenland, but not yet found farther south than.
Prince Edward’s Island on the American coast. It may, however, be expected at Eastport and our
northern border.
CLADOSTEPHUS, Ag.
(From κλ δος [sic] [klados], a branch, and στεφος [stephos], a crown.)
Fronds olive-brown, branching, secondary branches (leaves) whorled, apical growth
as in Sphacelaria; main stems densely corticated by growth of rhizoidal filaments,
secondary branches (leaves) naked, hairs borne in tufts just below the apex of
branches; unilocular and plurilocular sporangia on special branches (leaves),
stipitate.