Archive image from page 367 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 360 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. (Fig. 354). These are, as a rule, developed from the narrowings of the thallus and consist of a short stalk ending in a broad disc. As the specific name indicates the shape of the thallus reminds one very- much of that of Opiintia, being rather regularly narrowed and again enlarged, giving it a resemblance to a chain whose single joints are elongated elhptic. From the thickest part of the joints, which is Fig. 354. Catenella O
Archive image from page 367 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 360 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. (Fig. 354). These are, as a rule, developed from the narrowings of the thallus and consist of a short stalk ending in a broad disc. As the specific name indicates the shape of the thallus reminds one very- much of that of Opiintia, being rather regularly narrowed and again enlarged, giving it a resemblance to a chain whose single joints are elongated elhptic. From the thickest part of the joints, which is Fig. 354. Catenella Opuntia (G. et W.) Grev. Parts of plants, n, from below; h, from the side. (About 6:1). found frequently somewhat above the middle of the joint, one or commonly two opposite side-branches grow out, these sometimes be- ing erect, and sometimes bending downwards in different directions and fixed by haptera to the mangrove roots. By this way of growing a felted cover about 2 cms high is produced round the roots. From transverse and longitudinal sections of the thallus (comp. Okamura, Icones, , pi. 39) it appears that the tissue in the middle consists of several thick-walled fdaments running the length of the plant and composed of rather long, cyhndrical cells. From these cells thin filaments are given off in all directions towards the periphery, being bi-or tripartited several times, forming a very lacunose tissue. Near the periphery the filaments are much ramified, their cells becoming smaller and densely packed, forming in this way a firm cortical layer.
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