274 



from ordinary low-water mark to two or four meters depth on moles and boulders 

 in Skagerak, the northern Kattegat and the Limfjord, and it does not avoid exposed 

 places. In summer, a narrow belt of dead Corallina may be found at low-water 

 mark when the upper part of the Cora///na-association has been exposed to the air 

 during a long period of low-water. It can also occur abundantly and form asso- 

 ciations in deeper water, on gravelly or stony bottom, e. g. in the eastern Kattegat, 

 but it is then frequently associated with Lilhothanmia. In the sublittoral region it 

 descends frequently to 19 meters depth, but it has been met with at a depth of 

 29 meters in the northern Kattegat. As to the vegetative development of the frond 

 during the year I have no personal observations, but it must be supposed that the 

 growth begins in the last part of the winter and ceases in summer, and that old 

 fronds are thrown olT in autumn. Nelson and Duncan (Histology of cert. spec, of 

 Corallinaceae. Trans. Linn. Soc. Bot. Ser. 2 Vol. I. 1876 p. 203) indicate that there is 

 not much carbonate of lime in the frond in spring. Old fronds are often corroded 

 by various organisms. Ripe tetrasporangia were repeatedly met with in the months 

 of May to July, unripe in March. Ripe antheridia were found in May, ripe cysto- 

 carpia in May and December. 



Localities. Ns: ZQ, jydske Rev, 24,5 m; groin at Tiij'boren ; Klitmeller, 2 m. — Sk : Hanst- 

 holm, various places, 4 — 15 m; YM, YN, Bragerne, 1- 10 m; Bulbjerg and Svinklav, washed ashore; SZ, 

 Lekken, ZK', ZK', Lenstrup; Hirshals, mole and boulders near land, and 2 miles N.W. of Hirshals. 11 m; 

 H0jen, c. 5m. — Lf: Lemvig; Ydre Ren by Lemvig; ZY; Oddesund; MD; MF. MG, MH, Thisted in 

 Thisted Bredning; harbour of Struer; I; various places in Sallingsund; LS'; MI; Ejerslev Ron; Holm- 

 tunge Hage; Amtoft Rev; LQ. — Kn: Harbour of Skagen; KG, TV, Krageskovs Rev; Hirsholmene; K0I- 

 pen; Deget; Frederikshavn ; Marens Rev, Borrebjergs Rev; Nordre Renner; TJ ; TL; TH; UG; UB; ZL; 

 Jegens Odde; Trindelen; FF, FE ; IX; ZB, 29 m; TG. — Ke: IM, VY, IP, Fladen; XA, Lille Middelgrund : 

 EU, ET, 11, IK, f. robusta, dominant, at 14 meters depth. Store Middelgrund: ID, (f. robusta, 19m), IB, 

 HX, lA, 11-19 m; 00, Saborg Hoved Grund, 8,5 m. — Km: XF, Lsesa Rende; ZC, Kobbergrund; XB ; 

 XD; XC; TS; bK; FM; FN (i. robusta); ND. — Ks: Pakhusbugt, Anholt (loose); EM and EJ, Lysegrund; 

 HS, Briseis Grund; OS, Hastens Grund; OU, Schultz's Grund; D, Granne Revle north of Isefjord; aU, 

 off Lumbsaas; GF, Sjaellands Rev; FO, off Havknude; NB; FP, Jessens Grund. — Sa: MZ; KK and KJ, 

 south of Hjelm; KM; BE and BF, off Sletterhage, f. robusta, 10 m; MY; PL; Begtrup Vig; Kala Rev; 

 harbour of Aaihus; PK; FS, Vejro Sund N.E. of Samsa (f. robusta); MP; DK, Bolsaxen (f. robusta, 14 m); 

 MQ; AH'; Korshavn; Hofmansgave (Car. Rosenberg); NZ; PK, Norsminde Flak; BC: aX, south Side of 

 Endelave; AI' and DJ, by ^bela; FY, off Bjarnsknude, 5,5 m. Lb: Only found at the harbour of 

 Bogcnse and at FZ, Kasser Odde, the north side of the reef, 6,5 m. Never met with in the neighbour- 

 hood of Middelfart and Fsene, where numerous dredgings have been made. — Sb: Harbour of Kerte- 

 minde; NR, at the entrance to the harbour of Korser, only 1,5 m high, on stones picked up in the belt 

 (Nyborg). — In the German part of the western Baltic Sea Reinke records the species from the isle of 

 AIs and from Neukirchner Grund in Flensborg Fjord. At Kullen on the west coast of Sweden I have 

 not met with it. 



2. Corallina rubens L. 



Linne Syst. nat. Ed. 12. Vol. I. p. 1305. Kiitzing, Tab. phyc. 8. Band, 1858, p. 38, Taf. 80; Solms, Corall., 



p. 42; Hauck, Meeresalg. p. 278. 

 Jania rubens Lamour.; Kiitzing, Phyc. gener., 1843, p. 389, Taf. 79 II; Harvey, Phyc. Brit. pi. 252, 1851; 



Areschoug, in J. Agardh, Sp. g. o. Vol. II 1852, p. 557; Kny, Bot. Zeit. 1872, p. 350; Thuret, Etudes 



phyc. 1878, p. 99, pi. L, LI. 



