372 Pteridophyten. — Floristik etc. 



continuous through the earlier leaf gaps with the external endodermis 

 affords an indication of the instrusive and cortical origin of the pith. 

 A number of specimens of Botrychium Innaria were cut into com- 

 plete transverse series and showed very various structures; in some 

 cases the structure at the level of the nodes was consistent with a 

 theory of "pocketting" or intrusion; in other cases the pockets for- 

 med were very irregulär and incomplete; in yet other cases an 

 internal endodermis was entirely absent throughout the whole 

 development; and when present it always, both at the point of 

 branching and in the sporeling originates above the well marked 

 pith. Finally in B. Innaria centripetal tracheides ma}^ develop in 

 the pith above a region in which an internal endodermis was 

 found — i. e. in a tissue which on a theory of intrusion would be 

 regarded as cortical. Thus there seems to be an absence of direct 

 evidence to show that the pith is of cortical origin; the author holds 

 that this theory applies to the Ferns generally, possibly also to the 

 origin of the solenostele. 



The order generally seems to show indications of affinity with 

 the Coenopterideae {Botryopterideae and Zygopterideae)\ in this con- 

 nection the vestigial axillary buds described by Gwynne Vaughan 

 are noted and the constant occurrence of similar vestigial buds in 

 Botrychium Limaria is recorded. The leaf trace of Helminthostachys 

 affords further proof of this affinity. When the stele is strongly 

 mesarch the leaf trace may be mesearch also; as it passes out its 

 centrifugal xylem "often extends adaxially and meets to form a 

 complete ring; this encloses the centripetal xylem and some paren- 

 chyma". When the first division of the trace is about to take place 

 "a band of centrifugal xylem extends across and separates the two 

 halves of the bündle; within each half is some parenchyma and the 

 dying out remains of the centripetal xylem, so that the structure is 

 still mesarch". Bertrand and Cornaille in a paper on the Fern 

 leaf trace (Travaux et Memoires de l'Universite de Lille, Tome X, 

 N°. 29, p. 179.) have appropriatefy termed this stage "clepsydroid 

 trace", but have not described it fully. 



Isabel Browne (University College London). 



Maxon, W. R., A new name for a Hawaiian fern. (Amer. 

 Fern. Journ. II. p. 18—20. Febr. 29, 1912.) 



The new name Polypodium Saffordii Maxon is proposed for P. 

 minimiim Brack., on account of an earlier use of the latter name 

 by Aublet for a Guiana fern. The Hawaiian species is figured 

 and specimens cited. Maxon. 



Anonymus. Contributions to the Flora of Siam. (Kew Bull. 

 Mise. Inform. p. 144-155. 1912.) 



In this paper the following new species, all collected by Dr. 

 H. F. G. Kerr, are described by W. G Craib: Dasymaschalon 

 sootepense, Platymitra siamensis, Iniliusa euneata, Xylosma brachy- 

 staehys, Decaschistia siamensis, Helicteres Gagnepainiana, Pterosper- 

 mnni lütorale, Euonymus simüis, E. sootepensis, Indigofera laxißora, 

 Tephrosia Kerrii, T. repentina, Desmodium cephalotoides, Uraria ro- 

 tunda, Cassia Garrettiana, Parinarium albidnm, Terminalia obliqua, 

 T. tripteroides, Engenia siamensis, Begonia Acetosella, Sphenodesme 



