. Dansk botanisk arkiv. Plants; Plants -- Denmark. Dansk Botanisk Arkiv, Bd. 3. Nr. 1. In my material also I have found several times filaments in which the most part of the cells were transformed to akinetes (Fig. 1 d). These cells had each a very thick wall (about 2// thick) of a firm consistency, while on the other hand the common membrane in the whole filament is thin agreeing with the des- cription of ROSENVINGE. The akinetes escape through a hole in the membrane of the filament (comp. fig. 1 d). They have very dense granular contents and are often oblong, sometimes also globular or ellip
. Dansk botanisk arkiv. Plants; Plants -- Denmark. Dansk Botanisk Arkiv, Bd. 3. Nr. 1. In my material also I have found several times filaments in which the most part of the cells were transformed to akinetes (Fig. 1 d). These cells had each a very thick wall (about 2// thick) of a firm consistency, while on the other hand the common membrane in the whole filament is thin agreeing with the des- cription of ROSENVINGE. The akinetes escape through a hole in the membrane of the filament (comp. fig. 1 d). They have very dense granular contents and are often oblong, sometimes also globular or ellipsoidal; their diameter reaches a length of about 14//. The filaments reach a thickness of about 16—21 fi, while the vegetative cells are about 6—7 fji. In one case a specimen was found in which the main filament was about 25// and the diameter of the cells about 10 ju while the branches only reached the thickness mentioned above. Rosenvinge also mentions that he has found a single specimen of a similar thickness. The chromatophore is, as well known, starlike (Fig. 1 c). Having only examined specimens preserved in spirit I cannot say anything as to the colour of the plant. As several authors have stated that they have found Asterocytis ramosa in brackish water (comp. Rosenvinge, 1. c. p. 78) I may add that the plant in the West Indies was found in quite salt water. Found upon Liagora elongata at Long Point, St. Croix. Geogr. Distrib. Atlantic coast of Europe, Mediterranean Sea, North Asterocytis ramosa (Twaites) Gobi, a, part of a plant, b, summit of a filament with lon- ger cells, c, cells with chromatopho- re. d, part of a fila- ment with akinetes. (aand6,aboutl25:l, candc^,about 200:1). Goniotrichum Kütz. 1. Goniotrichum elegans (Chauv.) Le Jolis. Le Jolis, Alg. mar. Cherb., p. 103. Berthold, Bangiaceæ, p. 26. Hauck, Meeresalgen, p. 518. Ro- senvinge, Marine Alg. of Denmark, part I, p. 75. Bangia elegans Chauvin, Alg. Norm. no. 159; Mém. Soc. Linn. Norm., t.
Size: 837px × 2987px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
