. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. 168. Cystococcus, a—e from the thallus of hu- bricariatitiaeea. ^from the thallus of ^Afl«-o/A<?ro» coralloides. / from the thallus of Usnea barbata. c, d isolated algal cells, the rest with hyphae attached to them. c~-/ cells dividing, a—e and s magn. 390, y 700 times, yafter Fig. 169, Trentepohlia {Chroolepus umbrimtm. Kg.). a from the thallus of Lecanactis illeeebrosa, Duf. b from the thallus of Graf his serif ta. Magn. 390 times. Section CXV.
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. 168. Cystococcus, a—e from the thallus of hu- bricariatitiaeea. ^from the thallus of ^Afl«-o/A<?ro» coralloides. / from the thallus of Usnea barbata. c, d isolated algal cells, the rest with hyphae attached to them. c~-/ cells dividing, a—e and s magn. 390, y 700 times, yafter Fig. 169, Trentepohlia {Chroolepus umbrimtm. Kg.). a from the thallus of Lecanactis illeeebrosa, Duf. b from the thallus of Graf his serif ta. Magn. 390 times. Section Origin of the Lichen-thallus. If the ripe ascospore of the Lichen-fungus is placed on a moist substratum, it in most cases readily puts out germ-tubes; these may in some cases form numerous branches (see page 113), but they always perish after a certain time if they do not encounter suitable Algae, even when the germination has taken place on a substance favourable to the nutrition of the Lichen. Supposing the substratum to be favourable and the right Alga to be within reach (see Fig. 170), the germ-tube puts out branches on one side, which seize on the Alga. If the Alga consists of single isolated cells, as for instance in the Pleurococcus- lichens observed by Stahl, smaller branchlets are formed at the points of contact with an algal cell, which closely embrace it and inclose it in fresh ramifications. If the Alga is a compact pluricellular body, as in the Nostoc-lichens examined by Reess, in which the cells united together in rows are surrounded by broad gelatinous membranes and the protoplasmic bodies therefore are imbedded in a large quantity of an intermediate gelatinous substance, the hyphal branches penetrate into the jelly and put out branches in it which grow luxuriantly through the algal body and unite with the protoplasmic bodies of the cells. At the same time in all cases known to ' Trans. Linn. Soe. London, ser. 2,1, p. Please note that these images
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