Text-book of botany, morphological and physiological . al shoot has already been constituted by the formation of thewalls I, 2, 3, while the dorsal half of each of these segments has developed into half aleaf. The other segments which do not form shoots develope normal two-lobed is the process that occurs in Frullania, Madotheca, Mastigobryum, Lepidozia,Trichocolea, and Jungermannta trichophylla. A third type of branching occurs finally inRadula and Lejeunia, where the formation of leaves is not disturbed by the branch-ing, the branches springing from behind the leaves at their bas
Text-book of botany, morphological and physiological . al shoot has already been constituted by the formation of thewalls I, 2, 3, while the dorsal half of each of these segments has developed into half aleaf. The other segments which do not form shoots develope normal two-lobed is the process that occurs in Frullania, Madotheca, Mastigobryum, Lepidozia,Trichocolea, and Jungermannta trichophylla. A third type of branching occurs finally inRadula and Lejeunia, where the formation of leaves is not disturbed by the branch-ing, the branches springing from behind the leaves at their base, and from the samesegments. Besides these modes of ramification, which originate from particular outer cellsof the segments of definite position, Leitgeb has recently discovered also an endogenousformation of shoots, springing sometimes as fertile branches from the ventral segmentsprovided with amphigastria, while the exogenous shoots arise in the manner representedin Fig. 223, as, in Mastigobryum, Lepidozia, and Galypogeia; or they are formed. ^ Compare in reference to this what follows with respect to Mosses.^ What follows is partially derived from Leitgebs letters. HEPA TICM. oOQ without the production of a ventral row of leaves, as in Jungprmannia hicuspidata andother Jungermannieae with leaves in two rows. In those especially belonging to thesection Trichomanoideae the fertile branches have an endogenous origin, and breakout from the older parts of the stem as adventitious shoots; probably, however, theirmother-cells always originate regularly in acropetal succession in the primary meristemof the vegetative cone, as in Mastigobryum and Lepidozia (like they do in Equise-tacese). Finally, according to Leitgeb, the whole branching of many Jungermannieaeappears to depend exclusively on the endogenous production of branches. The reproductive organs are distributed monoeciously or dioeciously, and are formed,in the thalloid genera, on the dorsal side of the shoot; in the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
