160 



(Sk). Sexual organs and tetrasporangia occur always in distinct specimens. The 

 same is the case with the antheridia and the carpogonia; I have found, however, 

 some few specimens which seemed to be monoecious, but the supposed antheridia 

 were not fully developed. 



Localities. Sk: Lonstrup (loose on the shore); Hirshals, mole and reef. — Lf: Oddesund; 

 Nykobing (Th. Mort , F. Borg. !); Glyngore; Agersund (Th. M.); Aalborg (Th. M.) ; Hals (F. Berg.). — Kn: 

 Hirsholm; Kelpen; Frederikshavn ; Nordre Ronner. — Km: Anholt, harbour. — Ks: Harbour of Grenaa; 

 Hesselo; Isefjord : LA'niKs, harbour. — Sa: Coast below Ris Skov; Aarhus, harbour; Odense Fjord: inner 

 side of Enebterodden ; Hofmansgave (Lyngbye, Hofm. Bang, C. Rosenb.V — Lb: Bogense; Fredericia; 

 Middelfart; Kongebro; Snoghej; Fa?n0 Sound; Assens ; Faaborg; Dyreborg. — Sf: CT west of Taasinge; 

 Svendborg; Marstal, specimens up to 70 cm long, among Zostera in shallow water, frequently on Littorina; 

 Skaarupor; Lohals. — SI): South side of Hefsnies; Kerteminde; Korsor; Nyborg, harbour and Avernak- 

 hage; Vresen ; Spodsbjerg, harbour; DQ, 5,5 meters; UR, 7,5 meters. — Sill : VC, Venegrund 4 — 4,5 meters. 

 -- Su: Helleba>k; Helsinger (Liebman, C. Rosenb., !) ; Humlebaek; Sletten; TF', Staffans Flak, 12 — 13 

 meters. OG', between Trekroner and Middelgrund, c. 9,5 m; Trekroner (Liebman, 0rsted a. o.); RH, 

 Knollen, 9,5 m; Drager; PR, off Drager, 7,5— 9,5 m. — B\v: KU, Schonheyders Pulle, 6,5 m. 



Dilsea Stackhouse. 

 1. Dilsea ediilis Stackhouse. 



stackhouse, Mem. soc. Mosc. 11, p. 55,71 (non vidi). 



Fiicus ediilis Stackhouse, Ner. Brit. 1. ed. p. 57 (non vidi), U. edit. 1816 p. 22, tab. 12 (good). 

 Halymenia ediiUs (Stackh.) Agardh; Flora Danica tab. 2258, 1839. 



Iridcea edulis (Stackh.) Bory; Harvey, Phyc. Brit. pi. 97; Areschoug Pliyc. scand. p. 89; Kiitzing, Tab. 



phyc. 17. Band, tab. 3a. 

 Schizymciiia edulis (Stackh.) ,1. Agardh, Sp. g. o. II, 1851, p. 172. 

 Sarcophyllis edulis (Stackh.) J. Agardh, Sp. g. o. Ill, 1876, p. 265. 



From a basal disc a number of flat fronds arise. Their number may be 

 considerable, but when they are numerous they are for the greatest part feebly 

 developed. They attain not seldom a length of about 30 cm ; the largest specimen 

 I have measured was 61 cm long in a dried state. As to the anatomy of the frond, 

 reference may be made to the papers of Wille (Bidrag til Algernes physiologiske 

 Anatomi. K. sv. Vet. Ak. Handl. Bd. 21, 1885, p. 71. tafl. V fig. 61—67, and Beitriige 

 zur Entwickl. d. physiolog. Gewebesyst. Nov. Act. Leop. Car. Ak. Bd. LII Nr. 2, 1887, 

 p. 83, Taf. 5 fig. 72—74 and Taf. 6 fig. 75). 



In summer the species is always sterile. It is evidently frucliferous in winter, 

 just as on the British coasts. Tetraspores were found in specimens collected in 

 February to April; they were confined to round or oblong patches measuring at 

 the most 1 cm in diameter. In a specimen collected in May the spots were still 

 visible, but the sporangia were emptied. The sporangia are more or less deeply 

 immersed in the cortex. They arise directly from cells of the inner cortex, and are 

 thus intercalary, being outwardly connected through pits with filaments of the 

 cortex (fig. 76). The ripe sporangium is surrounded by a double sporangial wall. 

 The spores are paired, decussately or cruciately, the dividing walls are often inclined. 

 The spores contain a number of small chromatophores. 



The cystocarps are situated in the inner cortex, or at the limit between it and 



