. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. 58 isoEtacbae CQUillwort family) * * Leaves shorter above and below, stipule-lihe ; the lateral larger, 2-ranked. 3. S. ipus (L.) Spring. Stems tufted and prostrate, creeping, mucb branched, flaccid; leaves pellucid-membranaceous, the larger spreading hori- zontally, ovate, oblique, mostly obtuse, the smaller appressed, taper-pointed; those of the short spikes nearly similar ; larger spore-cases copious at the lower part of the spike. — Low, sha
. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. 58 isoEtacbae CQUillwort family) * * Leaves shorter above and below, stipule-lihe ; the lateral larger, 2-ranked. 3. S. ipus (L.) Spring. Stems tufted and prostrate, creeping, mucb branched, flaccid; leaves pellucid-membranaceous, the larger spreading hori- zontally, ovate, oblique, mostly obtuse, the smaller appressed, taper-pointed; those of the short spikes nearly similar ; larger spore-cases copious at the lower part of the spike. — Low, shady places, s. Me., southw. aiid westw. —A delicate little plant, resembling a Moss or Jungermannia, (S. A.) ISOETACEAE (QniLLwoRT Family) (Revised by A. A. Small aquatic or palustrine herbs of grass-like or rush-like aspect. Stem short, thick, and corm-Uke, crowned with numerous subulate leaves. Spores of two kinds in distinct axillary solitary sporangia. — A single genus; the species similar in habit and to be distinguished with certainty only by the aid of the compound microscope. 1. IS6eTES L. Qdillwokt Stem fleshy, more or less depressed, the roots arising from the 2-5-lobed base, the flattened top bearing the leaves from a central bud or crown. Leaves dilated and imbricated at base, rounded or somewhat angular above, orbicular in section, traversed by four air-tubes that are separated by cross-partitions, bearing a bast-bundle in the center and often 4 or more in the periphery. Stomata none or in narrow bands over the air-cavities. Sporangia in excavations of the dilated bases of the leaves (more or less covered by the velum, formed from the thin edges of the excavation), attached by their backs, orbicular to ovoid, plano-convex, trav- ersed internally by transverse threads, their thin integuments often bearing small dark sclerenchymatous cells. Spores dimorphous, the female or gyno- spores large (250-1000 jn or more in diameter), spherical, with an elevated
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