. Dansk botanisk arkiv. Plants; Plants -- Denmark. 448 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. slightly ramified or not at all, while in Acrochætiiim cæspitiformis the ramification is considerable; further, the sporangia in Acr. gracile, owing to the scanty ramification, are placed up along the main filaments, while in Acr. cæspitijorme they are found at the base of the branches. The plant was gathered at the end of February in shallow water near the shore. St. Croix: Salt River. 12. Acrochætiiim globosum Borgs. 13. — Sancti Thomæ Borgs. 14. — seriaium Borgs. 15. — flexiiosiim Vickers. 16. Acrochæ
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 448 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. slightly ramified or not at all, while in Acrochætiiim cæspitiformis the ramification is considerable; further, the sporangia in Acr. gracile, owing to the scanty ramification, are placed up along the main filaments, while in Acr. cæspitijorme they are found at the base of the branches. The plant was gathered at the end of February in shallow water near the shore. St. Croix: Salt River. 12. Acrochætiiim globosum Borgs. 13. — Sancti Thomæ Borgs. 14. — seriaium Borgs. 15. — flexiiosiim Vickers. 16. Acrochætium spec. Upon a young Padina Howeana a few plants of an Acrochætium were found, show- ing apparently some likeness to Acr. flexiw- sum. Having had so little material of it at my disposal, I prefer to leave it unnamed. It forms tufts up to more than one mm.; one specimens was about 1200« high. The base consists of short, creeping filaments (Fig. 417 a); these are irregularly bent, in the middle of the basal layer inter- woven and merging together, but with free ends. The cells in the basal filaments are about 8 n thick and 11 fx long. The erect filaments (Fig. 417 h) arising from the basal filaments are from 10—13 ix thick and the cells about 35 ii long. Upwards the main filaments do not taper much: until at about 8—11 pt. The filaments are very ramified; from near the base they carry branches given off irregularly at all sides with longer and shorter rows of bare cells in between, and often with some ten- dency to secund arangement. The branches are given off at acute angles; they seremto be rather rigid and are a little curved. They are somewhat thinner than the main filaments, at their base about 9 //, tapering to about 5 to 6 /i at their Fig. 417. Acrochætium spec, a, base of the plant, b, part of erect filament. i a, about 200:1; 6, about 150:1).. Please note that these images are extracted from scanned page images that may have been digitally en
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