172 



0rliage hy Klitmaller inside the point at 2 meters depth, fartlier fiom land off Klitmeller only a few 

 small specimens. — Sk : Collected at various places (Hanstholm; Bragerne; washed ashore by Svinkl0v 

 and Blokhus; Lonstrup; Hirshals: SUagen) in 2 to 13m depth, in most of the places only in small and 

 scarce specimens. F"ound in greatest number and best developed at Hirshals, near land in 5 m depth, 

 in company with Polijides. Greatest length observed 15 cm. — Lf: Widelj' distributed, down to a depth 

 of 6,5 m, but in most places loose, often in abundance on soft bottom (f. cegagropila). Reaches a length 

 of 8— 14cm. — Kattegat: Common and often abundant everywhere on stony bottom in depths down 

 to 15 cm. It reaches here a length of up to 28 cm and is ver3' often over 20 cm high. It has also been 

 dredged in several places in greater depths, down to 30 m (e. g. ZB, Trindelen, about 30 m; ZS, Fladen, 

 26,5 m; HZ, Store Middelgrund, 25,5 m), but it is more frequently missing than present in these greater 

 depths, and, at all events, it occurs only in small quantities. In Herthas Flak in Kn, where I have 

 dredged several times in 20 to 24,5 meters depth, it has never been met with. In Isefjord it has been 

 recorded in various places, in Holba?k Fjord it occujs abundantlj' in a loose condition. — Sa and Lb: 

 Common in depths down to 24 m; at aZ growing gregariously over coarse sand (see above). — Sf : 

 Several places. — Sb : Common in depths down to 20 m, greatest length observed 27 cm; generally well 

 developed specimens. — Sill : Several places down to 12 m depth; greatest length observed 10,5 cm — 

 Su : North of Helsinger up to 25 cm high, south of Helsingor in depths down to 13 m, up to 16 cm 

 high. — Bw: Found in depths down to 20 m; greatest length observed 24,5 cm. — Bill : Greatest length 

 observed 12 cm. — Bb: Found in depths from one to 38 m (YA, east of Bornholm) in several places, 

 but reaching only 9 cm in length. 



Fam. 6. Rhizophyllidaceae. 

 Polyides Agardh. - 

 ]. Polyides rotundus (Gmel.) Grev. 



Greville, Algse Britann., 1830, p. 70, Tab. XI. Harvey, Phycol. Brit. pi. 95, 1840. Caspary, Ann. and 

 Mag. N. Hist. Ser. 2, Vol. VI, 1850, p. 93. Thuret in Le Jolis Liste des Alg. mar. de Cherbourg, 1864, 

 p. 140. Thuret et Bornet, Etudes phycologiques, 1878, p. 73—80, pi. 37 — 39. Guignard, Developp. 

 et const, des antherozoides. Revue gen. de Botanique. I, 1889, extrait p. 44, pi. 6 fig. 10—12. Fr. 

 Schmitz, Kleinere Beitr. z. Kenntn. d. F'lorideen. II. La Nuova Notarisia. Ser. IV. 1893, Estratto p. 8. 

 Kolkwitz, Beitr. z. Kenntn. d. Florideen. Wiss. Meeresunters. N. F". 4. Bd. Abt. Helgoland. Heft 1, 

 1900. Denys, Anatom. Untersuch. an Polyides rotundus Gmel. und F"urcellaria fastigiata Lamour. 

 Beili. z. Jalirb. d. Hamburg, wissensch. Anstalten 1910. 



Fiicus rotundus Gmelin, Hist. Fucor., 1768, p. 110 tab. VI fig. 3. Flora Danica tab. 1544a (Hornemann 1816). 



Furcellaria rotunda Lyngbye, Tent. Hydr., 1819, p. 49. 



Polyides lumbricalis C. Agardh, Spec. Alg., 1822, p. 392, J. Agardh, Sp. g. o. II, 1863, p. 721. 

 Furcellaria himbricalis Kiitzing, Phycol. gener., 1843. p. 402, Taf. 72, Tab. phycol., Bd. 17, 1867, pi. 100. 



The external resemblance between this Alga and Furcellaria is well known 

 and has often been mentioned, as well as the difference of the basal part being a 

 disc in Polyides, while in Furcellaria it consists of branched rhizomes. The struc- 

 ture of the erect frond has already been thoroughly studied by Kutzing (1843) ' and 

 Caspaky (1850j. The structure of the upper end of the frond is that of the foun- 

 tain type (Oltmanns' "Springbrunnentypus") as plainly shown by Kutzing (1. c). 

 As to the structure of the erect fronds, reference may be made to the papers of 



' The troublesome synonymy of this Alga is responsible for the fact that Wille (Bidr. t. Alg. phys. 

 Anat. K. Svenska Vetensk. Ak. Handl. Bd. 21. 1885, tafl. VllI fig. 14) and Oltmanns (1904, p. 546, fig. 330) 

 have used copies of Kutzing's figures of it to demonsti-ate the anatomy of Furcellaria fastigiata (comp. p. 165). 



