Selaginella sentence example

selaginella
  • ix.Tristefic stein of Selaginella.
    0
    0
  • In Selaginella the stelar systeim h do~ shows profounder modifications.
    0
    0
  • The leaves of the true mosses and those of the club-mosses (Lycopodium, Selaginella) being somewhat alike in general appearance and in ontogeny, might be, and indeed have been, regarded as homologous on that ground.
    0
    0
  • - Diagrammatic sketches of prothalli of e, Selaginella.
    0
    0
  • All such special relations of the plant to its environment, which might be expected in the few forms of a large group which has persisted beyond the others, are less marked in the genus Selaginella.
    0
    0
    Advertisement
  • The single genus of this order (Selaginella) contains between three and four hundred species.
    0
    0
  • Selaginella is heterosporous, the megasporangia being often found towards the base of the cone.
    0
    0
  • Thus the position of the root in Selaginella is different from what obtains in the other Vascular Cryptogams. A point of interest in this heterosporous genus is that the formation of the prothallus may commence before the megaspore is liberated from the sporangium.
    0
    0
  • The cones, which in some instances at least were heterosporous, presented a general resemblance to those of Lycopodium and Selaginella, a single sporangium being situated on the upper surface of each sporophyll.
    0
    0
  • Each leaf bears a ligule resembling that of Selaginella in structure and position.
    0
    0
    Advertisement
  • The spores, which are set free by the rotting of the sporangial wall, germinate much as in the case of Selaginella, though the similarity may be a case of independent resemblance.
    0
    0
  • - Selaginella.
    0
    0
  • The primary structure of the stem was thus of a simple Lycopodiaceous type, resembling on a larger scale what we find in the upright stem of Selaginella spinosa.
    0
    0
  • Some analogy among recent Lycopods is afforded by the stem of Isoetes, and by the base of the stem in Selaginella spinosa; in the fossils the process was of a more normal type, but some of its details need further investigation.
    0
    0
  • The most interesting point in the structure of the leaf-base is the presence of a ligule, like that of Isoetes or Selaginella, which was seated in a deep pit, opening on the upper surface of the cushion, just above the insertion of the lamina.
    0
    0
    Advertisement
  • in the cone attributed to the Lower Carboniferous Lepidodendron Veltheimianum) the arrangement was that usual in Selaginella, the microsporangia occurring above and the megasporangia below in the same strobilus (diagram, fig.
    0
    0
  • In some Lycopoditeae the leaves were all of one kind, while others were heterophyllous, like most species of Selaginella.
    0
    0
  • In Selaginellites Suissei there was a definite strobilus bearing both microand megasporangia; in each of the latter from 16 to 24 megaspores were contained; in Selaginellites primaevus, however, the number of megaspores was only 4, and the resemblance to a recent Selaginella was thus complete.
    0
    0
  • The antiquity of the Selaginella type indicates that this group had no direct connexion with the Lepidodendreae, but sprang from a distinct and equally ancient herbaceous stock.
    0
    0
  • The country in general is a fern paradise, and the iridescent creeping Selaginella (akin to Lycopodium) festoons the undergrowth by the wayside.
    0
    0
    Advertisement
  • Selaginella - A few hardy kinds of this large family of Lycopods are valuable for carpeting the fernery or clothing shady spots in the rock garden.
    0
    0
  • The first formed portion of the stern in all species of Selaginella which have been investigated possesses an exarch haplostele.
    0
    1