. Principles of modern biology. Biology. The Plani Kingdom - 613 Carboniferous period, indeed, some Lycop- sida achieved the form of gigantic trees (see Fig. 29-13). Moreover, it is known that accu- mulated masses of these large Lycopsida gave rise to most of the present-day huge deposits of coal. Today the Lycopsida have diminished to just four genera (about 900 species) of small (usually less than 1-foot-tall) relatively unim- portant plants. These include the club mosses (Fig. 31-20) and the quilbvorts. The Lycopsida, like other Tracheophyta, have a dominant sporophyte generation, by which
. Principles of modern biology. Biology. The Plani Kingdom - 613 Carboniferous period, indeed, some Lycop- sida achieved the form of gigantic trees (see Fig. 29-13). Moreover, it is known that accu- mulated masses of these large Lycopsida gave rise to most of the present-day huge deposits of coal. Today the Lycopsida have diminished to just four genera (about 900 species) of small (usually less than 1-foot-tall) relatively unim- portant plants. These include the club mosses (Fig. 31-20) and the quilbvorts. The Lycopsida, like other Tracheophyta, have a dominant sporophyte generation, by which the species is commonly identified (Fig. 31-20). But the gametophyte, typically, takes the form of a semimicroscopic, color- less, subterranean thallus, such as is shown in Figure 31-21. Lycopsidan sporophytes, on the ANTHERIDIUM EMBRYO. Fig. 31-20. Modern lycopsidans are rather small pros- trate plants, such as this club moss (Lycopodium c/ava- tum). These plants also may be called "creeping ground ; Note the dichotomous branching of the stem and the conelike spore-bearing structures. (From The Plant World.). 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 Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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