29 
Localities. Lf: Sondre Ron by Lemvig; Thisted; off Skrandrup and off Hanklit, Thisted Bred- 
ning; Venø Bugt off Nørreskov; Nykøbing; Amtoft Rev and LQ, Lendrup Ren in Løgstør Bredning. - 
Kn: Deget by Frederikshavn, on Chondrus crispus; Nordre Ronner; UB, north of Læsø; Trindelen, 
on Rhodymenia 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. Cellule partis monostromaticæ (6—)7—9(—11) lat, diametro æquilongæ 
vel ad sesqui longiores; cell- 
ulæ corticales parvæ, ellip- 
tice. Trichocyti plerumque 
adsunt. Conceptacula spor- 
angifera hemisphærica vel 
subhemisphærica, diametro 
80—140 —185 », dum dense 
posita confluentia. Tectum 
1— 2 cellulis crassum. Cell- 
ulæ ostiolum circumdantes 
a ceteris paulo diversæ, non- 
nunquam ostiolum versus 
paulo elongatæ, vel papillas 
horizontales formantes. Osti- 
olum interdum in rostrum 
breve protractum. Sporangia 
quadripartita et bipartita, 
Fig. 168. 
Melobesia Fosliei. A—C, from Deget. A, monostromatic frond seen from 
42—60 u longa, 18 —30 12 lata. above. B, vertical section of a sporangial conceptacle showing one four- 
C t I ] x parted sporangium. C, vertical section of sporangial conceptacle showing 
onceptacula mascula parva one two-parted sporangium. The orifice has not been hit by the section. 
immersa, paulo prominentia ; D-E from Hirsholmene. D, orifice of sporangial conceptacle seen from 
above. E, tetrasporangium. 350:1. 
spermatia lineari-clavata, le- 
niter curvata in fundo conceptaculi gignuntur. Conceptacula feminea eadem forma 
et structura ac conceplacula 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 Algæ. They are rather variable in several respects, but as the 
differences are met with not only between specimens growing on different 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 frequent. Trichocytes were usually present, situated 
at the offspring of ramifications, but in some cases they were searched for in yain. 
D. K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk. og mathem. Afd. VII, 2. 32 
