Fam. 13. Rhodomelacezæ. 
J. G. AGARDH (1863), Species, genera et ordines Floridearum. Vol. II pars 3. 
Lity Barren (1923), The Genus Polysiphonia, Grev., a critical revision of the British species based upon 
anatomy. The Journal of the Linnean Society. Vol. 46 No. 308. 
P. FALKENBERG (1901), Die Rhodomelaceen des Golfes von Neapel. Fauna und Flora des Golfes von 
Neapel. 25. Monographie. Berlin. 
L. Kny (1873), Ueber Axillarknospen bei Florideen. Festschr. z. Feier d. hundertj. Best. d. Ges. d. naturf. 
Freunde zu Berlin. 
L. KoLDERUP ROSENVINGE (1884), Bidrag til Polysiphonia’s Morfologi. (Résumé francais). Botan. Tidsskr. 
Bind 14. 
—, (1902), Ueber die Spiralstellungen der Rhodomelaceen. Jahrb. für wiss. Bot. Bd. 37. 
— , (1903), Sur les organes piliformes des Rhodomelacées. Overs. K. Danske Vidensk. Selsk. Forh. Ko- 
benhavn. 
C. NÂGELt (1846), Polysiphonia. Zeitschrift für wiss. Botanik von Schleiden und Nägeli. 3. u. 4. Heft. 
Zürich. 
R. W. Paizzirs (1896), Development of the Cystocarp in the Rhodomelaceae. II. Annals of Botany X. 
Fr. Schmitz und P. FALKENBERG (1897), Rhodomelaceae. Engler u. Prantl, Die natürl. Pflanzenfam. I, 2. 
S. YAMANOUCHI (1906), The life-history of Polysiphonia violacea. Botan. Gazette, Vol. 42 p. 401—449, 
plates 19—28. 
See further p. 297. 
Heterosiphonia Mont. 
1. Heterosiphonia plumosa (Ellis) Batters. 
Batters, Catalogue of Brit. Mar. Algæ. 1902, p. 83. 
Conferva plumosa Ellis, Philosoph. Transact. Vol. 57, 1768, p. 424, Tab. 18, fig. c, d. 
Conferva coccinea Hudson, Fl. angl. Ed. 2, 1878, p. 603. 
Callithamnion coccineum Lyngbye, Tent., 1819, p. 144. 
Dasay coccinea Agardh, Spec. Alg. II, 1828, p. 119; Flora Danica tab. 2456 (1845) (f tenuis); Harvey, 
Phye. Brit. III, 1851, pl. 253; Areschoug, 1850, p. 42; J. Agardh, 1863, p. 1185; Kny, 1873, p. 108, 
Taf. II Fig. 7; Janezewski, Dev. du cystoc. d. 1. Florid: Mém. Cherbourg, 
Vol. XX, 1877, p. 129, pl. 4, figs. 19—21, pl. V, figs. 1—8; Buffham, 
Reprod. Organs, espec. Anther., Journ. Queck. micr. Club, Vol. III Ser. II 
1888, p. 263, pl. XXII, figs. 19—20; Phillips, 1896, p. 187, pl. XII 
figs. 1—7. 
Trichothamnion hirsutum Kütz., Tab. phyc. 14, tab. 90. 
Heterosiphonia coccinea Falkenberg, 1901, p. 648, Taf. 18 Fig. 21; Kylin, 
1907, p. 149. 
The structure and development of the frond have been 
described by Kny (1873) who first recognised the sympodial 
character of the ramification. The cells of the monosiphonous 
pinnules contain a number of small nuclei and numerous 
minute chromatophores (fig. 336). 
Fig. 336. The Danish specimens generally agree with 8, tenuis J. 
Helerosiphonia plumosa. Cell Agardh, 1. c. The older stems are usually naked, sometimes, 
showing chromatophores and À Ex 
HSL, Eli. however, beset with numerous adventitious branchlets. 
