. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 13^ I 3. Peyssonnelia (Cruoriella) Boergesenii nov. spec. Thallus totus adnatiis, valde calcarius, superficie levi cum singulis venis conspicuis, e centro ad peripheriam currentibus, constans hypothallo et perithallo. Hypothallus constat filamentis repentibus, juxtappositis, flabella angusta, elongata, efficientibus. Cellula apicalis longa; cellulæ filamentorum hypothalli æque altæ aut altiores ac cellulæ apicales. In speciminis juvenilibus omnes cellulæ filamentorum repen- tium fere æquales, i
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 13^ I 3. Peyssonnelia (Cruoriella) Boergesenii nov. spec. Thallus totus adnatiis, valde calcarius, superficie levi cum singulis venis conspicuis, e centro ad peripheriam currentibus, constans hypothallo et perithallo. Hypothallus constat filamentis repentibus, juxtappositis, flabella angusta, elongata, efficientibus. Cellula apicalis longa; cellulæ filamentorum hypothalli æque altæ aut altiores ac cellulæ apicales. In speciminis juvenilibus omnes cellulæ filamentorum repen- tium fere æquales, in speciminis adultioribus axis principalis con- spicuus, cellulis majoribus. Perithallus divisus in partem inferiorem, cellulis magnis, tetragonis aut IV2 altioribus quam latis, altis 40—36 /^, latis 40— 36—20 fi et in partem superiorem, cellulis gradatim decrescentibus. Cellulis periphericis multo brevi- oribus quam latis, altis 10 //, latis 20 fA. Nemathecia cum carposporis quadripartitis zonatis, paraphyses cellulis longioribus quam latis, altis 40—36—16-12 fjt, latis 6—8— 12/7. et cellulis apicalibus monili- formibus. Nemathecia cum tetra- sporangiis ignota. Thallus altus ± 500 //, nemathecia 240 /^. Peyssonnelia (Cruoriella) Boer- gesenii^) (Fig. 142) distinguishes itself by its smooth surface marked with delicate but distinct veins, visible to the naked eye and running in a fan-shaped di- rection from the centre towards the periphery. These veins are quite different from the radial lines, we observe f. i. in the thal- lus of P. rubra and depend probably upon the axis with large cells of the hypothallus. In a dried state the colour of the thal- lus is very striking owing to the greenish hue of the dark purple frond. In the collection of Dr. BørCxESEN are four numbers from the same locality that I believe belong to this species, though in structure they show some differences, but these differences depend on the age of the individuals. Seen from below
Size: 1896px × 1318px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
