1<^>*^) Rhodora [August 



art- more or less abundant; in R. subjusca the rannili are cylindrical 

 or taperinjr. Xuincrou.s varieties of R. /i/ropodioides are described 

 and figured by Kjellnian. Algae of the Arctic Sea, p. 107; as all of 

 these, and also the tV)rnis of R. .snbfu.sra, have marked seasonal varia- 

 tions, the result is often confusing. The Harpswell material varies 

 considerably, mostly agreeing with forma fi/pira subforma fcucra 

 Kjellman, some, however, is more like forma fruui.^-.s-lma. Distributed 

 as V. B.-A., Xo. 1295. 



Hhodochortox pemcilliforme (Kjellm.) Rosenvinge, Annales 

 des Sciences Xaturelles, Series (i, Bot., Vol. XIX, p. 66 Like the 

 nearly allied R. mcmhranaccum Magnus, this species grows on Brij- 

 ozoa, Scrtii/aria etc., the two species often in company; they an-, 

 however, easily distinguished. In R. metnhraiinrrum the filaments 

 grow freely inside the tubes of the host, sometimes so densely as to 

 form an apparent membrane or cellular mass; rather short branches 

 6-S n thick break through the wall, and on these the terminal tetra- 

 spores are usually borne; in R. pruici/liformr there is a disk of laterally 

 united radiate filaments on the outer surface of the host; from this 

 arise rather long erect filaments, about 12 ,« diameter, bearing lateral 

 tetraspores. It was found at Xewport, R. I., in May, 1904, on a 

 bryozoan attached to a Laminaria. 



Rhododer.mis eleg.w.s Crouan in J. G. Agardh, Species Algarmn, 

 Vol. II, p. 505. The genus Rhododermis was founded on this species, 

 the fronds occurring as small bright red spots on fragments of china 

 and pottery in the harbor of Brest, France. The frond consists of a 

 disk composed of one or two layers of laterally united, radiate filaments ; 

 on this disk are formed sori of cruciate tetraspores intermixed with 

 clavate, more or less curved, paraphyses. R. ehgans has been found 

 at Harpswell, .Alaine, and at Revere Beach, Mass., in both cases on 

 the shells and claws of live crabs. Distributed as P. B.-A., No. 1248. 

 Rhododermis parasitica Batters, Algae of Berwick-on-Tweed, 

 p. 92, PI. XI, fig. 2, A & B. In this si)ecies the frond is thicker than 

 in /?. elegauft, aj)i)earing in cross section as if composed of denselv 

 packed, vertical filaments, with cells longer than broad; the color is 

 darker, almost black. It occurs, both in Europe and with us on 

 stipes of Laminaria species, and was found at Magnolia, Mass bv 

 Prof. W. G. Farlow. ' ' 



RnODODERMts Georgii (Batters) Collins, in Phyc. Bor.-Am., Xo. 

 1299. Rhodophtjseuma Georgii Batters, Journal of Botany, Vol. XXIX, 



