Lang.—Studies in the Morphology and 
Text-fig. 4. Series of sections through the first branching specimen, to show the closure of a leaf-gap and the relation to it of the vestigial bud 
(a-c) : the departure of the next leaf-trace which subtends a branch (c-e) : the derivation of the outer and inner xylem of the branch stele from the 
accessory outer xylem and from inner xylem of the main stele (c-H) ; and the completion of the organization of the branch stele (i, j). The accessory 
xylem is cross-hatched. Further description in text. l.t., subtending leaf-trace ; x. 2 , accessory xylem ; x. 1 , inner xylem passing through leaf-gap; 
e.br. } endodermis of branch stele ; x.o.br outer xylem of branch ; x.z.br., inner xylem of branch. 
