. Elements of plant biology. Plant physiology. THALLUS OF PELLIA 233 growing on soil among damp herbage, or in marshes. Pellia has no differentiation into distinct stem and leaves, any more than Fucus has. The body con- sists of a flat green thallus, which may^be elongated. Fig. 36.—Pellia. A, plant (natural size) growing in bright light with crowded branches; spn., sporogonia of various ages, the oldest with long stalks and open capsules. B, part of thallus on a larger scale, showing forking at the tip; rh., rhizoids arising from lower side; «,, antheridia; spn., sporogonium with opened spore
. Elements of plant biology. Plant physiology. THALLUS OF PELLIA 233 growing on soil among damp herbage, or in marshes. Pellia has no differentiation into distinct stem and leaves, any more than Fucus has. The body con- sists of a flat green thallus, which may^be elongated. Fig. 36.—Pellia. A, plant (natural size) growing in bright light with crowded branches; spn., sporogonia of various ages, the oldest with long stalks and open capsules. B, part of thallus on a larger scale, showing forking at the tip; rh., rhizoids arising from lower side; «,, antheridia; spn., sporogonium with opened spore capsule showing bunch of hair-like elaters (el.). and band-shaped, or may (especially in bright light) grow slowly in length and branch freely so that the plant is tufted (Fig. 36). The margins of the thallus (wings) are often " crisped " because they have grown quicker than the thicker central part, or midrib. The latter bears on its under surface brown rhizoids (Fig. 36, B, rh.), which enter the soil and absorb from it water and dissolved salts. A thin cross-section of the thallus shows that all the cells are living and may ^ contain chloroplasts, though these are mainly concentrated in the upper (sometimes also in the lower) surface layer. This represents an incipient differentiation of photosynthetic. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tansley, Arthur George, 1871-. London, George Allen & Unwin Ltd. ; New York, Dodd, Mead & Co
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantph, bookyear1922
