. Dansk botanisk arkiv. Plants; Plants -- Denmark. Fig. 285. Bn/othamnion Seaforthii (Turn.) Kütz. Part of the thallus. (.About 4:1). fellosen generischen Zusammen- hörigkeit mit B. trianguläre ange- nommen werden muss, dass die schwach entwickelten Blätter von B. trianguläre hier grösstentheils ganz abortirt sind. Häufig abortiren übrigens selbst die Blätter an den erlöschenden Spross-Spitzen mehr oder ; This has not been altogether confirmed by the ex- amination of my material. The figure 284 shows the growing summit removed from the surrounding protecting branchlets. From this
. Dansk botanisk arkiv. Plants; Plants -- Denmark. Fig. 285. Bn/othamnion Seaforthii (Turn.) Kütz. Part of the thallus. (.About 4:1). fellosen generischen Zusammen- hörigkeit mit B. trianguläre ange- nommen werden muss, dass die schwach entwickelten Blätter von B. trianguläre hier grösstentheils ganz abortirt sind. Häufig abortiren übrigens selbst die Blätter an den erlöschenden Spross-Spitzen mehr oder ; This has not been altogether confirmed by the ex- amination of my material. The figure 284 shows the growing summit removed from the surrounding protecting branchlets. From this it is evident that the growth of Bryothamnion Seaforthii takes place in a very similar way to that of Bryothamnion tri- guetrum. As in this species, trichoblasts issue from every second segment; the trichoblasts are once forked, each of the filaments consisting of 4 cells, and are upon the whole much like those found in Br. triquetrum; the only difference seems to be that the cells are much shorter. On the other hand their diameter is somewhat longer, about 20 /y.; sometimes one of the filaments bears a short sidebranch. But while in Bryothamnion triquetrum, the trichoblasts are placed in a screw line round the summit with a divergency of 120, in the present species they are placed di- stichously with a divergency of 180 ^. From the basal cells of each of the trichoblasts an axillary branch issues. These branches grow quickly and are bent inwards over the young summit. I can not say how far the trichoblasts are placed exactly with a diver- gency of 180'^ or some smaller variations are to be found; in every case some small oscillations seem to be present as the branches alternately place their summits over or under the following. Fig. 286. Bryothamnion Seaforthii (Turn.) Kütz. 'Transverse section of the thallus. (About 30:1). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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