THE MAKINE ALG.E OF NEW ENGLAND. 109 



to retain the name Trentepohlia which was once adopted by Harvey, and at a later 

 date also by Pringsheim, since it sufficiently indicates that the species in question 

 should be kept distinct from Callithamrtion, and at the same time does not assume the 

 existence of cystocarps like those described by Thuret and Bornet in C. corymbifera. 



T. vtrgatula, (Harv.). ( Callithamnion virgatulum, Harv., Phyc. Brit., 

 PL 313 ; E'er. Ain. Bor., Part II, p. 243.) PL X, Fig. 3. 



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

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

 threes along the branches. 



Var. secund ATA. (Callithamnion luxiirians, Ner. Am. Bor. — C. secnn- 

 datum, Lyngb.) 



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



On Ceramiunij Laminaria stems, and other algae. The variety espe- 

 cially on Zostera. 



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

 Maine. 



A common species found in summer on different algae. On the filamentous species 

 it forms small tufts, and on Zostera it fringes the margins of the leaves with a fine 

 plush scarcely more than a quarter or half an inch high. The synonymy of the species 

 is very complicated, it having been confused with the next by some writers. The 

 variety is common on Zostera, and is usually found in American herbaria bearing the 

 name of C. luxurians. There is little doubt that it is the C. Imurians of the Nereis Am. 

 Bor., but whether it is the species described under that name by Agardh is doubtful. 



T. DAYTEsn, Harv. (Conferva Daviesii, Engl. Bot., PL 2329. — Cal- 

 lithamnion Daviesii, Phyc. Brit., PL 314.) 



Fronds minute, tufted, branches scattered, patent, bearing in their 

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



On Bhodymenia. 



Gloucester, Mass. 



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

 efflorescent, Thuret, kept as a distinct species by most writers, in which the branches 

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

 heads in the axils. This form has been found on Cystoclonium purpurascens at' Gay 

 Head. 



Among the genera whose relations to the Floridece must be considered doubtful are 

 Choreocolax and Pseudoblaste, described by Reinsch in Contributiones ad Algologiam et 

 Fungologiam. Of the last-named genus a single species, of the former five species, are 

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

 of rose-colored filaments, which are parasitic in the fronds of different Floridece, upon 

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

 threads of the Choreocolax and in part of the distorted tissues of the host-plant. The 

 species of Pseudoblaste consist of aggregations of cells arranged in longitudinal series, 

 which form hemispherical masses on the surface of different Floridew. In neither genus 

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

 must be regarded as inadequate, since it by no means follows that plants consisting of 

 rose-colored filaments belong to the Floridece. One often finds on our coast Floridece whose 



