Biology

Cover Biology
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42. — Pteridium aqiiilinjtm. The underground stem or rhizome {rh.), one frond (U) of the present j-ear in full leaf, the other (1-) of the past year; ab, apical bud bearing apical cell at the extremity of a branch bearing stumps of leaves of previous seasons; 1\ mature active leaf; 1-, dead leaf of the preceding year; l.vt., lamina of leaf; p, pinna; x, younger pinna shown enlarged at B. (After Sedg- wick and Wilson.) THE COMMON BRAKE 111 Fig. 42.
112 PLANTS, THE FOOD OF ANIMALS with roots and
...rhizoids stretching out in all directions for the absorption of water and salts. The fronds grow up at intervals from the underground stem, a single, vigorous rhizome often bearing several fronds (Fig. 42).
The Rhizome. — The main stem of the underground part may- be a simple root-like structure of practically uniform size and several feet in length, or it may be branched, with numerous lateral rhizomes penetrating the earth in different directions.
The main rhizome and its branches lie a few inches below the surface and always parallel with that surface, while roots grow out from it into the earth below.


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