. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Phæophyceæ of the Danish W. Indies. 21 The sporangia are cylindrical or somewhat clavate and dis- persed between them we find the club-shaped paraphyses some- times rather numerous, sometimes very scarce or even wanting. According to Mitchell the paraphyses originate from the basal cell of the sporangia and therefore are not formed until after the disappearance of the sporangia. As to this I must point out that I have found paraphyses scattered also between the plurilocular sporangia in the sori (see Fig. 12). It is a common speci
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Phæophyceæ of the Danish W. Indies. 21 The sporangia are cylindrical or somewhat clavate and dis- persed between them we find the club-shaped paraphyses some- times rather numerous, sometimes very scarce or even wanting. According to Mitchell the paraphyses originate from the basal cell of the sporangia and therefore are not formed until after the disappearance of the sporangia. As to this I must point out that I have found paraphyses scattered also between the plurilocular sporangia in the sori (see Fig. 12). It is a common species and occur mostly in sheltered or not much exposed places in shallow water. Geogr. Distrib. Widely distributed in all warmer seas so far north as to the south coast of England. Hydroclathrus Bory. 1. Hydroclathrus cancellatus Bory. Bory, Diet, class. VIII, p. 419 (non vidi). Harvey, Phycologia Austra- lia, pi. 98; Nereis, p. 120, tab. IX A. Mitchell, M., in Murray, Phyc. Memoirs, p. 53, pi. XV, fig. 2—4. Thuret, G. et Ed. Bornet, Etudes phycologiques, 1878, p. 12—13. Vickers, A., Phycologia Barbadensis, Part II, pi. 23. Asperococcus cancellatus Endl., Mantissa Botanica altera, Suppl. 3, 1843, p. 26. Halodictyon cancellation Kiitz., Phycologia generalis, 1843, p. 336. Encoelium clathratum Ag., Spec. Alg. p. 412. Stilophora clathrata Ag. in "Flora", 1827, p. 642. Asperococcus clathratus J. Ag., Spec. Alg. I, p. 75. In "Etudes Phycologiques", 1. c, Thuret and Bornet have pointed out that while the sporangia entirely cover the surface of the young plants the old specimens with the well known peculiar reticular appearance are quite sterile with the exception of some few spo- rangia occurring now and then near the groups of hairs. Having only collected old specimens mine, in accordance with this obser- vation, were sterile; even near the hair groups I have not succeeded in finding Fig. 13. Hydroclathrus cancellatus Bory. SDOranffia Transverse section of th
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