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; 
Nykøbing (Th. Mort. F. Borg. ! Glyngøre; Agersund (Th. M); Aalborg (Th. M.); Hals (F. Borg.). — Kn: 
Hirsholm; Kelpen; Frederikshavn; Nordre Renner. — Km: Anholt, harbour. — Ks: Harbour of Grenaa; 
Hessels; Isefjord: Lynæs, harbour. — Sa: Coast below Ris Skov; Aarhus, harbour; Odense Fjord: inner 
side of Enebærodden; Hofmansgave (Lyngbye, Hofm. Bang, C. Rosenb.). — Lh: Bogense; Fredericia; 
Middelfart; Kongebro; Snoghøj; Fæns 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; 
Skaaruper; Lohals. — Sh: South side of Refsnæs; Kerteminde; Korser; Nyborg, harbour and Avernak- 
hage; Vresen; Spodsbjerg, harbour; DQ, 5,5 meters; UR, 7,5 meters. — Sm: VC, Venegrund 4—4,5 meters. 
— Su: Hellebæk; Helsingør (Liebman, C. Rosenb., !); Humlebæk; Sletten; TF‘, Staffans Flak, 12—13 
meters. OG”, between Trekroner and Middelgrund, c. 9,5 m; Trekroner (Liebman, Ørsted a. o.); RH, 
Knollen, 9,5 m; Drager; PR, off Drager, 7,5—9,5 m. — Bw: KU, Schönheyders Pulle, 6,5 m. 
Dilsea Stackhouse. 
1. Dilsea edulis Stackhouse. 
Stackhouse, Mém. soc. Mose. II, p. 55,71 (non vidi). 
Fucus edulis Stackhouse, Ner. Brit. 1. ed. p. 57 (non vidi), II. edit. 1816 p. 22, tab. 12 (good). 
Halymenia edulis (Stackh.) Agardh; Flora Danica tab. 2258, 1839. 
Iridea edulis (Stackh.) Bory; Harvey, Phye. Brit. pl. 97; Areschoug Phye. scand. p. 89; Kützing, Tab. 
phye. 17. Band, tab. 3a. 
Schizymenia edulis (Stackh.) J. Agardh, Sp. g. o. II, 1851, p. 172. 
Sarcophyllis edulis (Stackh.) J. Agardh, Sp. g. o. III, 1876, p. 265. 
From a basal dise 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 Beiträge 
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 fructiferous 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 1cm 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 
