The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ase with the lower lobe. The folding of one lobe againstanother assists in the retention of water. Pitcher-like structureshave arisen in different ways in a number of genera, and are especiallycommon in epiphytic forms (Frullania, Lepidolaena, _ Pleurozia).In some forms the leaves are finely divided, and along with the hair-like paraphyllia form a loose weft around the stem (Trichocolea).The rhizoids spring from the lower surface of the stem, and sometimesfrom the bases of the leaves. The branches
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ase with the lower lobe. The folding of one lobe againstanother assists in the retention of water. Pitcher-like structureshave arisen in different ways in a number of genera, and are especiallycommon in epiphytic forms (Frullania, Lepidolaena, _ Pleurozia).In some forms the leaves are finely divided, and along with the hair-like paraphyllia form a loose weft around the stem (Trichocolea).The rhizoids spring from the lower surface of the stem, and sometimesfrom the bases of the leaves. The branches arise below and by theside of the leaves. The sexual organs may occur on the same or on distinct antheridia are protected by leaves which are ofteii modified inshape. The archegonia are borne at the apex of the main stem or ofa lateral branch. A single archegonium may arise from the apicalcell (Lejeunea); more commonly a number of others are formedfrom the surrounding segments. The leaves below the archegonialgroup are frequently modified in size and shape, but the chief pro-. From Strasburgers Text-book of Bo-tany. Fig. 7.—Blasia pusilla.(X 2.) The margin of thethallus bears leaf-like , Rhizoids; s, sporogonium. tection is afforded by a tubular perianth, which corresponds to acoherent whorl of leaves and grows up independently of perianth serves also to enclose and protect the sporogoniumduring its development. In a number of forms belonging to differentgroups the end of the stem on whicb the sporogonium is borne grows
Size: 1544px × 1618px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
