Archive image from page 219 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 212 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. often getting a penicilliform appearance. The cells in these branchlets are nearly cylindrical, being in the middle of the branchlet about 80// long and 25/ broad. The chromatophores (Fig. 194 a, b, c) are parietal, consisting, in the quite young cells, of shorter or longer irregularly shaped plates ; in more developed cells they have the shape of a small roundish disc and finally in the old mature cells we find them like the thi
Archive image from page 219 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 212 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. often getting a penicilliform appearance. The cells in these branchlets are nearly cylindrical, being in the middle of the branchlet about 80// long and 25/ broad. The chromatophores (Fig. 194 a, b, c) are parietal, consisting, in the quite young cells, of shorter or longer irregularly shaped plates ; in more developed cells they have the shape of a small roundish disc and finally in the old mature cells we find them like the thin, sinuate ribbons generally found in this group of algæ. One nucleus is present in each cell. Hairs are wanting; at least I have not found any in my material. Male (Fig. 196) and female (Fig. ] 95 b) plants as well as tetrasporic plants (Fig. 195 a) occurred in the collection. Jud- ging by the rather scarce ma- terial at hand the tetrasporic and the female plants are the most vigorously developed and also most common, while the antheridial plants seem to be more slender and rare. The tetrasporangia (Fig. 195 a) are spherical, lining the upper (inner) side of the filaments in the branchlets, issuing singly at the upper end of each joint. They are tetrahedrally divided. Their diameter reaches a length of about 45/7; their wall is about 2,5/< thick. The antheridial stands (Fig. 196) are pedicellate, subcylindric- al bodies about Idfj. long and 40/z broad; the stalk is about 30/i long and 12 fx broad. They are found in the same places as the tetrasporangia, lining the upper side of the filaments. They originate from a cell which is richly filled with protoplasm. This cell is divided by transverse walls into 3—4 superposed cells (Fig. 196 c). These increase in size and, with the exception of the lower part of the basal cell which forms the stalk, are divided gradually by several anticlinal and periclinal or more Fig. 197. Mesothamnion caribaeum nov. spec. Two procarps with
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