. Text-book of botany, morphological and physiological. Botany. MUSCI. 37* to the female receptacles, while the habit of the male receptacles is altogether different. In the former the archegonia and antheridia occur either close to one another at the summit of the stem in the centre of the envelope (Perichcetimn), either in two groups, or separated by peculiar enveloping leaves, and the antheridia stand in the axils of these arranged in a spiral, surrounding the central group of archegonia. The form of the perichaetium is, in the female and bisexual receptacles, that of an elongated almost cl
. Text-book of botany, morphological and physiological. Botany. MUSCI. 37* to the female receptacles, while the habit of the male receptacles is altogether different. In the former the archegonia and antheridia occur either close to one another at the summit of the stem in the centre of the envelope (Perichcetimn), either in two groups, or separated by peculiar enveloping leaves, and the antheridia stand in the axils of these arranged in a spiral, surrounding the central group of archegonia. The form of the perichaetium is, in the female and bisexual receptacles, that of an elongated almost closed bud, formed by several turns of the leaf-spiral. Its leaves are similar to the foliage-leaves, and become smaller towards the interior, but grow all the more vigorously after fertilisation. The male perichaetium consists of broader firmer leaves, and is of three different forms; usually it is bud-shaped, and resembles that of the female receptacle, but is shorter and thicker, its leaves often coloured red, and decreasing in size towards the outside; receptacles of this type are always lateral. Secondly, the male perichaetia are sometimes shaped like capitula, and are, on the contrary, always terminal on a stouter shoot and globular; their leaves are broad, sheathing at the base, thinner and recurved at the upper part; they become smaller towards the interior, and leave the centre of the receptacle, with the anthe- ridia, free; these receptacles are sometimes borne on a naked pedicel, a prolonga- tion of the stem (Splachnum, Taylorid). Finally, the male perichaetia are sometimes discoid and consist 6f leaves which are very different from the foliage-leaves; they are broader and shorter, expanded horizontally at the upper part, delicate and of a pale green, orange, or purple colour; they are always smaller the nearer the leaf-spiral approaches the centre ; the antheridia stand in their axils (Mnium, Poly- trichurri) Pogonatum, Dawsonid). The para- physes stand between or by
Size: 949px × 2634px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
