. Dansk botanisk arkiv. Plants; Plants -- Denmark. pedicellate examples also occur. The spor- angia are placed upon the lowermost cells of the branches mostly only two or three upon each fila- ment ; but they also occur upon the main Fig. 36. Acrochsetium opetigenum nov. spec. filaments. a, Transverse section of Dasya elegans with basal COLLINS has de- parts of three plants two of which fixed to the base -r. Arrorhjp- of a pinnule and showing the cuneate endophytic sciiüeu dii Jiuuutai process penetrating into the tissue of the host and tium {A. Dasyæ) also one fixed to the pinnule itself, b,
. Dansk botanisk arkiv. Plants; Plants -- Denmark. pedicellate examples also occur. The spor- angia are placed upon the lowermost cells of the branches mostly only two or three upon each fila- ment ; but they also occur upon the main Fig. 36. Acrochsetium opetigenum nov. spec. filaments. a, Transverse section of Dasya elegans with basal COLLINS has de- parts of three plants two of which fixed to the base -r. Arrorhjp- of a pinnule and showing the cuneate endophytic sciiüeu dii Jiuuutai process penetrating into the tissue of the host and tium {A. Dasyæ) also one fixed to the pinnule itself, b, basal part of an pi nn^im older vigorous plant showing the endophytic cuneate ^^unu upon jjubya process and further two short epiphytic branchlets ; elegans which seems from that to the kftjn^^erect ^filament is issued, ^osely related to the present species. It has for instance the same globular persistent basal spore but this emits, as described by Collins, "a short, descending process, some- times branched, of a few small rounded cells, attached to the host". I have examined the specimens, distributed in Phycotheca , No. 1342 and have seen these short, 2—3 celled branches. As far as I can observe these branches are not endophytic and they are upon the whole quite different to the descending process found in my plant. Besides this difference my species has a very different appearance, is much larger in all parts of the thallus, much more branched and the ramification is not secund. Found upon Dasya elegans in a depth of about 20 meters. St. Jan: Off Cruz Bay. 12. Acrochætiuin robustum nov. spec. Thallus cæspitosus, usque ad 1 mm longus, e filis erectis et fihs horizontalibus epiphyticis compositus. Spora germinans in texturam hospitis pau- lum penetrans; a superiori parte, non immersa, fila brevia repentia, plus minus lateraliter con-. Fig. 37. Acrochse- tium opetigenum nov. spec. Sporan- gia-bearing filaments with chromato- phores and pyreno- ids. (Abo
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