The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 172 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. composed of slender sacs (Jsri), having thread-shaped cells intermixed ; and each ascus contains few or several spores, which are commonly double or treble. Most Lichens are flat expansions of grayish hue ; some of them foliaceous in texture, but never of bright green color; more are crusta- ceous; some are wholly pulverulent and nearly formless. But in several the vegetation lengthens into an axis (as in Fig. 580), or imitates s
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 172 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. composed of slender sacs (Jsri), having thread-shaped cells intermixed ; and each ascus contains few or several spores, which are commonly double or treble. Most Lichens are flat expansions of grayish hue ; some of them foliaceous in texture, but never of bright green color; more are crusta- ceous; some are wholly pulverulent and nearly formless. But in several the vegetation lengthens into an axis (as in Fig. 580), or imitates stem 578 580 575 and branches or threads, as in the Reindeer-Moss on the ground in our northern woods, and the Usnea hanging from the boughs of old trees overhead. 5l6. Fungi. For this immense and greatly diversified class, it must here suffice to indicate the parts of a Mushroom, a Sphseria, and of one or two common Moulds. The true vegetation of common Fungi consists of slender cells which form what is called a Mycelium. These filamentous Fig. 575. A stone on which various Lichens are growing, such as (passing from left to right) a Parmelia, a Sticta, and on the right, Lecidia geographica, so called from its patches resembling the outline of islands or continents as depicted upon maps. 576. Piece of thallus of Parmelia conspersa, with section through an apothecium. 577. Section of a smaller apothecium, enlarged. 578. Two asci of same, and contained spores, and accompanying filaments; more magnified. 579. Piece of thallus of a Sticta, with section, showing the immersed apothecia; the small openings of these dot the surface. 580. Cladonia coccinea; the fructi- fication is in the scarlet knobs, which surround the cups.
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