Organography of plants, especially of the archegoniatae and spermaphyta . a crisped one-layered cell-surface at the margin of its many-layered thallus, giving it a strik-ing appearance as it grows uponthe Cordilleras of Merida. Themarginal fringe arises out of the middle lobe in the forking ofthe thallus -, and it reminds usof the relationships which havebeen described in Aneura endi-viaefolia ^. Dendroceros. The remark-able relationships of Dendrocerosfoliatus (Fig. 51) were touched upon when speaking of the formation ofleaves, and it was shown that on the edge of the thallus cap-like formati
Organography of plants, especially of the archegoniatae and spermaphyta . a crisped one-layered cell-surface at the margin of its many-layered thallus, giving it a strik-ing appearance as it grows uponthe Cordilleras of Merida. Themarginal fringe arises out of the middle lobe in the forking ofthe thallus -, and it reminds usof the relationships which havebeen described in Aneura endi-viaefolia ^. Dendroceros. The remark-able relationships of Dendrocerosfoliatus (Fig. 51) were touched upon when speaking of the formation ofleaves, and it was shown that on the edge of the thallus cap-like formationsare found which are partly laid down as special shoots at the vegetativepoint and partly proceed from the middle lobes. These structures haveevidently the same significance as the water-sacs of Metzgeria same arrangement is found in Karstens Dendroceros inflatus. Thecells in the one-layered surface of the thallus of Dendroceros frequentlyseparate from one another, and the schizogenetic intercellular spacesincrease the spongy nature of the whole Fig. 50. Anthoceros fimbriatus. Portion of a thallusseen from below; the rhizoids are not shown. The one-layered crisped lobes at the edge hold water. Magnified. * See Stephani, Colensos New Zealand Hepaticae, in Journal of the Einnean Society, Botany,xxix (1892), p. 265. - See p. 21 and Fig. 14. ^ See p. 53 ; adventitious shoots may arise from them. RETENTION OF WATER. PARAPHYLLIA 57 These examples show that in dijfevent cycles of affinity the thalloseHepaticae exhibit analogojis adaptations. When we deal with formation oftubers we shall find additional evidence of this.
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