. Botanisk tidsskrift. Botany; Plants; Plants. — 145 - The species is nearly related to Myrionema balticum (Rke.) and Myrionema globosum (Rke.) but differs from the former by the condition of the margin of the basal disc, the branched and the sessile sporangia, from the latter chiefly by the unbranched assimilative filaments. var. filamentosa nov. var. The basal portion of the frond consists of free horizontal filaments, irregularly branched and creeping between the apices of the sporangia and paraphyses of Laminaria hyperborea; the thickness of these filaments is about 7 a. Well developed rhi
. Botanisk tidsskrift. Botany; Plants; Plants. — 145 - The species is nearly related to Myrionema balticum (Rke.) and Myrionema globosum (Rke.) but differs from the former by the condition of the margin of the basal disc, the branched and the sessile sporangia, from the latter chiefly by the unbranched assimilative filaments. var. filamentosa nov. var. The basal portion of the frond consists of free horizontal filaments, irregularly branched and creeping between the apices of the sporangia and paraphyses of Laminaria hyperborea; the thickness of these filaments is about 7 a. Well developed rhizoids are frequently occurring and grow in- wards between the paraphyses and sporangia of the sorus. The erect portion of the frond consists for the most part of plurilocular sporangia, 5,8 —7 K e Fig. 4. Myrionema Corunnœ Sauv. var. filamentosa. a, b, d, e 316: 1. a 550: 1. a a horizontal filament with rhizoids and an assimilative filament; b branched horizontal filaments, c fragment of a horizontal filament with a hair enclosed in a sheath below; d fragment of horizontal filament with a rhizoid, young- filaments and plurilocular sporangia; e fragment of horizontal filament with two rhizoids and a plurilocular sporangium. broad and 30 — 44// long, consisting of a single series of loculi; they are usually sessile and simple and I have but seldom met with stalked or branched sporangia. The assimilative filaments I have found much more rare (than the sporangia), they are 5,8 fi thick and nearly of the same length as the sporangia. I have only met with basal hairs, and these were enclosed in a short sheath below. The hairs are rare. As far as I can see in my alcohol material there is only one chromatophore in each cell. The unilocular sporangia are unknown. This variety differs chiefly from the typical Myrionema Gorunnæ in the condition of the basal portion; I have sometimes met with specimens of the typical form, with the margin of the basal disc partly consisting of free
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
