326 Anatomie. 



BoODLE, L. A., Comparative anatomy of the Hymeno- 

 phyllaceae, Schlzeaceae and Gleichenlaceae. Partlll. On 

 the Anatomv of the Gleicheniaceae. (Annais of Botany. 

 Vol. XV. No.^LX. Dec.:i901.) 



The Author gives a detaiied account of the anatomy of the 

 stem, leaf, root and seedling in this order with special reference 

 to the vascular System. Ä solenostele is discovered for the 

 first time in the Gleicheniaceae in G. pectlnata. The Insertion 

 of the leaf-trace upon the stem stele is fully described in 

 several species, and it is shewn that islands of sclerotic tissue 

 are found in the stele at the nodes which are continued into 

 the base of the leaf-trace and which, according to the species 

 may or may not come into continuity with the cortex in this 

 region. The question whether this nodal structure is to be 

 regarded as an ancestral remnant of a former solenostelic 

 condition, or as a local modification of the stele leading to- 

 wards solenostely is discussed; the latter supposition being 

 favoured by the author. 



In the node of G. pectlnata in addition to the sclerotic 

 mass in the center of the stele there are two small nodal 

 islands in the upper part of the xylem ring: It is suggested 

 that the extension and fusion of these islands would produce 

 a double vascular ring like that in Matonla pectlnata. 



Platyzoma is shewn to possess a medullate stele with 

 annular xylem, and internal endodermis. The departure of a 

 leaf-trace leaves no leaf-gap. d. T. Gwynne-Vaughan. 



Jeffrey , Edward C, The anatomy and developement 

 of the stem in the Pterldophyta and Gymnosperms. 

 (Annais of Botany. Vol. XV. p. 779. Dec. 1901.) 



This abstract deals with the nature and developement of 

 the fibro-vascular skeleton of the higher plants. The writer 

 regards the so-called medullated monostelic type of central 

 cylinder as derived by specialisation accompanied by degeneracy 

 from the so-called poiystelic type of Van Tieghem. Two 

 main types of tubulär cylinder are distinguished, the clado- 

 siphonic and the phyllosiphonic; the Lycopslda (Lycopodlales 

 and Eqiilsetales) belong to the former and the Pteropslda 

 (Flllcales and Phanerogams) to the latter. 



D. T. üwynne-Vaughan. 



WoRSDELL, W. C. , The Vascular structure of the 

 Flowers of the Gnetaceae. (Annais of Botany. Vol. XV. 

 p. 766. Dec. 1901.) 



The peripheral ring of vascular Strands found in the axis 

 of the female cone of Welwltschla are regarded by the writer 

 as belonging to the concentric type, and as homologous to the 

 peripheral ring of Strands in the vegetative axis of certain 

 Cycads, and of Welwltschla itself. In this phylum, he wises, 



