. Plants; a text-book of botany. Botany. 158 PLANT STEUCTUEES tvijcltium) (Fig. 129) and adder's tongue (OpJiioglossum) (Fig. 130). It is important to note, however, that the Horsetails and Club-mosses are Eusporangiates, as well as all the Seed-plants. Another small but interesting group of Ferns includes the "Water-ferns,"' floating forms or sometimes on muddy- flats. The common Miirsilia may be taken as a type (Fig. 133). The slender creeping stem sends down numerous roots into the mucky soil, and at intervals gives rise to a comparatively large leaf. This leaf has a long erect pe
. Plants; a text-book of botany. Botany. 158 PLANT STEUCTUEES tvijcltium) (Fig. 129) and adder's tongue (OpJiioglossum) (Fig. 130). It is important to note, however, that the Horsetails and Club-mosses are Eusporangiates, as well as all the Seed-plants. Another small but interesting group of Ferns includes the "Water-ferns,"' floating forms or sometimes on muddy- flats. The common Miirsilia may be taken as a type (Fig. 133). The slender creeping stem sends down numerous roots into the mucky soil, and at intervals gives rise to a comparatively large leaf. This leaf has a long erect petiole and a blade of four spread-. PlG. 133.—A water-fem (Marsilia). showing horizontal stem, witli descending roots, and ascend- ing leaves; a, a young leaf showing circinate vernation ; s, 5, sporophyll branches ('' spo- rocarps ").—After Bischoff. Pig. 134. One of the floating water-ferns iSal- mnia), showing side view (.41 and view from above {B). The dangling root-like processes are the modified submerged leaves. In .1, near the top of the cluster of submerged leaves, some sporophyll branches ("sporo- carps") may be seen.—After Bischoff. ing wedge-shaped leaflets like a " four-leaved ; The dichotomous venation and circinate vernation at once sua:- gest the fern alliance. From near the base of the petiole. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
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