The structure & development of the mosses and ferns (Archegoniatae) . platyphylla, which corre- sponds with it in allstructural points. The plant grows Fig. 41.—PorellaBola7ideri{KvLSt.). A, Female plant, X4 ; UDOn TOcks eSOeciallv?, archegonial branches ; B, an open sporogonium,X4 ; C, a male plant, X4 ; (J, the antheridial branches. but alsO UpOn the trUnkS of trees, and forms densemats closely covering the substratum. It branches extensively,but always monopodially, dichotomous branching never occurringin the acrogynous Jungermanniaceae. The slender stem is com-pletely hidden above by the t
The structure & development of the mosses and ferns (Archegoniatae) . platyphylla, which corre- sponds with it in allstructural points. The plant grows Fig. 41.—PorellaBola7ideri{KvLSt.). A, Female plant, X4 ; UDOn TOcks eSOeciallv?, archegonial branches ; B, an open sporogonium,X4 ; C, a male plant, X4 ; (J, the antheridial branches. but alsO UpOn the trUnkS of trees, and forms densemats closely covering the substratum. It branches extensively,but always monopodially, dichotomous branching never occurringin the acrogynous Jungermanniaceae. The slender stem is com-pletely hidden above by the two rows of closely-set, overlapping,scale-like leaves. Upon the ventral side, which is fastened byscattering rhizoids to the substratum, there is a row of muchsmaller leaves (Amphigastria), more or less irregularly dorsal leaves are nearly oval in outline, but the two-lobed form, that is very conspicuous in many species, is not sonoticeable here. The amphigastria are much smaller, and moreelongated than the dorsal leaves. The structure of the leaf is. IV THE 97 of the simplest character, consisting of a single layer of polygonalcells containing numerous chloroplasts. The plants grow where they are exposed to alternatewetting and drying up. They may at any stage becomecompletely dried up, and on being moistened will resume atonce their activity. In the dried condition, the species underconsideration often remains for several months without
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
