FERXS. 



351 



and forming the lateral pinna? ; while the branches, the growth of which is favoured 

 form the rachis of the leaf or of the branch of a leaf '. 



I'he Fortnatio?i of Adventitious Buds, which do not result from the terminal 

 branching of the stem, is, in Ferns, connected with the leaves. These buds make 

 their appearance on the leaf-stalk or on the lamina itself. The shoots of Pteris 

 aquilijia which spring from the leaf-stalk (Fig. 261) stand at the back of the 



Fig. ^2.—.ls/>id!H»i Filixmas; A longitudinal section through the end of a stem, v the apical part of the stem st, 

 b b leaf-stalks, *' a young leaf still rolled up, the rest enveloped in long palere, ^ fibro-vascular bundles ; B a leaf-stalk 

 of the same plant broken off, bearing at .* a bud with several leaves, iv a root of this bud ; C a similar leaf-stalk cut 

 through lengthways, bearing a root at lu and a bud at h; D end of a stem with the leaf-stalks cut off with the exception 

 of the youngest leaves of the terminal bud in order to show the arrangement of the leaves, the spaces between the 

 stalks b b are filled with numerous roots which themselves all spiing out of the stalks; E end of a stem the cortex of 

 which has been peeled off in order to show the net-work of fibro-vascular bundles i^; F a mesh of this net-work slightly 

 magnified, showing the basal portions of the bundles which pass into the leaves. 



individual leaf-stalks near the base; in Aspidium Filix-inas (Fig. 262) they arise 

 at a moderate height above the insertion, usually on one of the lateral edges of the 

 leaf-stalk. In both cases Hofmeister states that they are formed on the young 



^ It must be observed here also that Hofmeister applies the term 'dichotomy' in a much wider 

 sense than is usually done. New examinations of a large number of species are greatly to be desired, 

 both in reference to the formation of leaves and to the terminal branching of the stem. 



