249 



Localities. Lf : Sendre Ren by Lemvig; Thisted; off Skrandiup and off Hanklit, Thisted Bred- 

 nlng; Vena Bugt off Narreskov; Nykabing; Anitoft Rev and LQ, Lendrup Ron in Lagster Bredning. — 

 Kn: Deget by Frederikshavn, on Cliondrus crispus; Nordre Ranner; UB, nortfi of Laes0; Trindelen, 

 on Rliodymenia palmata, 19 meters. — Sa: AY, off Ashoved, on Laminaria digitata, 10 meters. 



4. Melobesia Fosliei sp. n. 



Frons minuta ambitu irregulari, monostromatica vel prope conceptacula poly- 

 stromatica. Cellulaj partis monoslromalicse (6— )7 — 9( — latse, diametro sequilongse 

 vel ad sesqui longiores; cell- 

 ulse corticales parvtie, ellip- 

 licae. Trichocyti plerumque 

 adsunt. Conceptacula spor- 

 angifera hemisphserica vel 

 subhemisphserica, diametro 

 80—140-185/^, dum dense 

 posila confluentia. Tectum 

 1— 2 cellulis crassum. Cell- 

 ulse ostiolum circumdantes 

 a ceteris paulo diversse, non- 

 nunquam ostiolum versus 

 paulo elongatse, vel papillas 

 horizontales form antes. Osti- 

 olum interdum in rostrum 

 breve protractum. Sporangia 

 quadripartita et bipartita, 

 42— 60r< longa, 18-30// lata. 

 Conceptacula niascula parva 

 immersa, paulo prominentia; 

 spermatia lineari-clavala, le- 

 niter curvala in fundo conceptaculi gignuntur. Conceptacula feminea eadem forma 

 et structura ac conceptacula sporangifera. 



The specimens referred to this species were found growing on the fronds of 

 Polysiphonia nigrescens, Corallina rubens, C. officinalis and on Bryozoans living in com- 

 pany with these Algae. They are rather variable in several respects, but as the 

 differences are met with not only between specimens growing on ditTerent substrata, 

 but also in specimens growing on the same alga, I do not hesitate in referring them 

 all to the same species. 



Most of the specimens were found growing on Corallina rubens; these speci- 

 mens may first be mentioned here. The structure of the monostromatic frond much 

 resembles that of M. Lejolisii,. except that the lateral walls seem to be thinner (less 

 incrustated ?). Lateral fusions are frecfuent. Trichocytes were usually present, situated 

 at the offspring of ramifications, but in some cases they were searched for in vain. 



D. K. D. Vidensk. Selsk. Skr., 7. Kiukke, natui vidensk. og mathem. Afd. VIl. 2. 32 



Fig. 168. 



Melobesia Fosliei. A — C, from Deget. A, monostromatic frond seen from 

 above B, vertical section of a sporangia! conceptacle stiowing one four- 

 parted sporangium. C, vertical section of sporangial conceptacle showing 

 one two-parted sporangium. The orifice has not been hit by the section. 

 D-E from Hirsholmene. D, orifice of sporangial conceptacle seen from 

 above. E, tetrasporangiuni. 350:1. 



