. Botanisk tidsskrift. Botany; Plants; Plants. — 339 - covered stones and rocks at high-water mark with a dense matted growth. My specimens were gathered in the middle of August and conserved in alcohol; they are all sterile and attain a length of 1,5 mm. The head is usually shorter than the stalk, but specimens having the head longer than the stalk also occur, as seen by following measurements: The stalk The head Thickness Length Thickness Length above below above below 44 p 22 p. 1233 p 87 p 49 p 630 p 37 - 13 - 1300 - 77 - 44 - 460 - 22 - 12 - 638 - 28 - 22 - 900 - The head is usually disti
. Botanisk tidsskrift. Botany; Plants; Plants. — 339 - covered stones and rocks at high-water mark with a dense matted growth. My specimens were gathered in the middle of August and conserved in alcohol; they are all sterile and attain a length of 1,5 mm. The head is usually shorter than the stalk, but specimens having the head longer than the stalk also occur, as seen by following measurements: The stalk The head Thickness Length Thickness Length above below above below 44 p 22 p. 1233 p 87 p 49 p 630 p 37 - 13 - 1300 - 77 - 44 - 460 - 22 - 12 - 638 - 28 - 22 - 900 - The head is usually distinctly clavate, sometimes nearly obovate and occasionally nearly cylindric, especially in younger plants. Plants, in which head and stalk insensibly merge into each other (cfr. my fig. 2, b, e, f, g and AI. Braun ]. c. Tab. I, fig. 7 — 9) are frequent in my material, but specimens having the head distinctly separated from the stalk with a constriction (fig. 2, c, d, h) as figured by Börgesen (1. c. fig. 106; cfr. also AI. Braun 1. c. Tab. I, fig. 14-15) also occur. The distinctness of the constriction is highly varying and both of these forms are thus connected with transitory forms. The thickness of the membrane, measured in the upper part of the head, is usually about 7 tu, but I have not rarely found it varying from 3 — 10/./. The more thinwalled specimens seemed to be in a younger stage of age; the more thickwalled plants usually contained large quantities of starch. The membrane is composed of. Fig. 2. Codiolum gregarium Al. Br. a a specimen with a branched head; b, e, f\ g show specimens, in which head and stalk insensibly merge into each other; c, d, h showing the constriction h moreover shows the transverse lavers of the stalk (compare the text). (40:1.) three layers, as already noticed by AI. Braun (1. c): 1° a thin, external layer (exoderma, cuticula AI. Braun) turning light yellow by chlor-zinc- iodide, covers the whole surface both of head and stalk. 2° a th
Size: 1343px × 1861px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
