VII. Nemastomatales. 
Fam. Rhodophyllidaceæ. 
Cystoclonium Kützing. 
1. Cystoclonium purpureum (Huds.) Batters. 
Batters, Catalogue Brit. Mar. Alg., Journ. of Bot. 1902, p. 68. 
Fucus purpureus Hudson Fl. Angl. 1762, p. 471 (not seen, teste Batters). 
Fucus tuberculatus Lightfoot Fl. Scot. II, 1777, p. 926. 
Fucus corallinus ©. Fr. Müller Fl. Dan. tab. 709 (1777). 
Fucus scorpioides O. Fr. Müller Fl. Dan. tab. 887! (1782). 
Gigartina confervoides Lyngbye Hydr. 1819, p. 43 (quoad specim. Dan.).” 
Gigartina purpurascens Lyngbye Hydr. 1819, p. 46 (exclus. var. y rostrala). 
Sphærococcus purpurascens Hornemann, Fl. Dan. tab. 1835 (1825). (Primary branches too numerous). 
Cystoclonium purpurascens Kützing Phye.gen. 1843, p.404, Taf. 58 I; id. Tab. phyc. 18 p1.15 (1868); J. Agardh, 
Sp. g. o. ILı, 1851, p. 307; Wille Bidrag, 1885, pp. 17, 30, 33, 76, pl. II figs. 20—22, IV figs.46, 47, VI 
figs. 74—76; Schmitz u. Hauptfleisch 1896, p. 370, fig. 222 C; A. Henckel, Sur l’anat. ete. des 
Algues mar. Cystoclonium purpur. et Chordaria flagelliformis; Seripta bot. 
Petropol. fasc. 19, 1902; Kolderup Rosenvinge, Hyal. hairs, 1911, pp. 206— 
209, fig. 4; Kylin 1907, p. 131; id. 1917 p. 22; id. Entwick. Florid., 1923, 
pp. 22— 30. 
Hypnea purpurascens Harvey, Phyc. Brit. pl. 116, 1846. 
Gracilaria purpurascens Nägeli, Die neu. Algensyst. 1847, p. 241. 
The structure and development of the frond of this common 
species has repeatedly been studied by NÄGELı, KÜTZING, WILLE, 
HENCKEL and Kyrın. The apical cell of the frond is divided by 
oblique walls that are inclined alternately to the right and to the Fig. 589. 
1 : 3 A is Cystoclonium purpureum. 
This figure is interpreted in J. AGarpu’s Sp. g. 0. Il.ı p. 307 as re- pin of fro showing 
D D Tip of frond showing 
presenting Cystoclonium purpurascens; in the same work Il.ıı p. 587, however, the apical cell and ils 
it is determined as Gracilaria confervoides “(fide spec. a Hoffm. datis)”. The divisions. 560 : 1. 
latter determination cannot be upheld; the figure represents a Furcellaria 
beset with two specimens of an Alga which is probably Cystoclonium purpureum. It should be noted, 
however, that the picture does not correctly represent the base of a Cystoclonium fixed to the Furcellaria, 
and the specimen to the left is not fixed to it at all. Cystoclonium purpureum is very often fixed to 
this substratum in Nature, whereas Gracilaria confervoides is always fixed to stones. 
* In LYNGBYE's herbarium one specimen only of Gigartina confervoides is to be found. It bears 
the following inscription: “Ex Hindsholm Fioniæ, Jan. 1816, ded. Hofman”. It is an old denudated 
specimen of Cystoclonium purpureum easily recognizable by the base which is still preserved. On the 
wrapper LYNGBYE has first written: Fucus confervoides; Fucus has then been changed into Gigartina 
and (probably later) purpurascens has been added to the name Gigartina. It is without doubt this 
specimen which is mentioned by LYNGBYE l. c. 
