. Biology and human life. Biology. THE SORTING OF PLANTS AND ANIMALS 77 64. The main groups of plants. The chief groups of plants are indicated in the following outline: BRANCH I —THALLOPHYTES. Plants showing no differentiation into true stem and •J' mi- UI4 Fig. 40. Reproduction in moss a, a leafy moss plant (Hypnum moUuscum)\ b, section cut lengthwise through tip of one of the branches, showing position of archegonia, or egg-bearing organs; c, single archegonium, more highly magnified, showing single large egg cell; d, enlarged view of antheridiiim, or sperm-bearing organ, of Polytric
. Biology and human life. Biology. THE SORTING OF PLANTS AND ANIMALS 77 64. The main groups of plants. The chief groups of plants are indicated in the following outline: BRANCH I —THALLOPHYTES. Plants showing no differentiation into true stem and •J' mi- UI4 Fig. 40. Reproduction in moss a, a leafy moss plant (Hypnum moUuscum)\ b, section cut lengthwise through tip of one of the branches, showing position of archegonia, or egg-bearing organs; c, single archegonium, more highly magnified, showing single large egg cell; d, enlarged view of antheridiiim, or sperm-bearing organ, of Polytrichiim jormosum, discharging sperm cells; e, greatly magnified view of sperm cells; /, tip of leafy plant from the archegonium of which a spore plant has grown, showing stalk and spore capsule A. ScHizoPHYTES (''Splitting plants")• Each cell splits into two; no other reproduction. 1. Cyanophyceae. Splitting plants with chlorophyl—the blue- green algas. (Examples. Oscillatoria, Rivularia, Nostoc.) 2. Schizomycetes. Splitting plants without chlorophyl. This group includes all the 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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