Further statements as to this species cannot be given owing to the very scarce 
material at hand. 
The synonyms given are all dubious, as also mentioned by Fosrie. The species 
described by Heyprıcn resembles FosLie’s species by 
the structure of the frond, but if his description is 
correct, it cannot be identical with it, and must even 
belong to another genus, as the conceptacle is said 
to have as many openings as it contains sporangia. 
HEYDRICH's description of the cortical cells also does 
not agree with those of M. minutula, as they are said 
to cover,the half of the cells of the disc; in M. mi- 
nutula they are very narrow, covering only a small 
part of the underlying cells. It must therefore be Fig. 173. 
concluded that HEYDRICH's species cannot be identified Melobesia minutula. Part of frond with 
3 A conceptacle. 200:1. 
with M. minutula. 
The plant was found growing not only on the Bryozoan but also on Ceramium 
tenuissimum attached to the same Polysiphonia. 
Locality. Kn: TP, Tenneberg Banke, 16 meters, September. 
6. Melobesia trichostoma sp. n. 
Frons primo monostromatica, dein, saltim maxima ex parte, polystromatica, 
usque ad 8 cellulis crassa, plerumque tamen e pluribus lobis vel frondibus secun- 
dariis minoribus, partim sese invicem obtegentibus composita, lobis plerumque usque 
ad marginem polystromaticis. Cellule frondis monostromatice vulgo 7—8 y crassæ, 
latitudine plerumque paulo longiores, cellulis corticalibus transverse ellipticis munitæ. 
Frons adulta e filis verticalibus composita, cellulis longitudine vario, latitudine 
1—3-plo longioribus. — Conceptacula sporangifera verruciformia, parum elevata, 
superne applanata, diametro 160-280 y. Tectum planum, crassum, c. 5 cellulis 
crassum. Ostiolum pilis numerosis, sursum longioribus, superioribus ex ostiolo pro- 
minentibus ornatum. Sporangia tetraspora, 42—63 » longa, 17—29 y lata. Concep- 
tacula mascula non prominula, ostiolo in tubo longo, sæpe curvato, protracto. 
Spermatangia lineari-clavata in fundo plano conceptaculi e cellulis depressis pro- 
creata, dense stipata. — Conceptacula cystocarpifera eadem forma magnitudineque 
ac sporangifera el peristomio simili ornata. 
The speeimens on which this species is founded formed dull rose-coloured 
erusts on the shells of living Trochus cinerarius collected in the Limfjord. They were 
referred to Lithothamnion Lenormandi by FosLıe in 1905 and are also rather like 
old specimens of that species, especially the forma squamulosa. The frond is at first 
monostromatic, and the marginal part may remain so, much resembling that of M. 
Lejolisii, with well developed cortical cells, which seen from above are elliptical. 
A parietal body, situated closely at the outer wall in these cells is very intensely 
