388 Pteridophyten. — Floristik, Geographie, Systematik etc. 



togen of the root is derived from the inmost layer of the periblem 

 of the Stern, the plerome and periblem from the stem plerome. 



The roots run down in the cortex of the stem until the level 

 of the soil is reached before they grow out. The xylem Strand ot 

 the root stele is usually diarch and curved into the form of a cres- 

 cent the convexity of which is directed towards the stem stele. The 

 Single Strand of phloem lies in its concavity. Sometimes the crescent 

 of xylem is incomplete on its convex side and then the stele is 

 regarded as tetrarch. The metaxylem elements are either scalariform 

 or with several rows of pits. D. T. Gwynne-Vaughan. 



Sykes, M. G., The Anatomy and Morphology of Tniesipteris. 

 (Ann. of Bot. XXII. 85. p. 63. 1908.) 



The departure of the branch or "sporophyll" trace leaves a gap 

 in the ring of xylem Strands that is found in the style of the aerial 

 stem while that of the ordinary foliage leaves does not do so. The 

 author points out, however, that this is really only a question of degree 

 and is due to the earlier preparation for the formation of "sporoph3dl" 

 than of leaf-traces. A Single vascular Strand enters each fertile 

 branch and there divides into three. The two lateral are the traces 

 of the two leaves. The median one enters the pedicel of the synan- 

 gium and again divides into three. Of these the central one soon 

 terminates while the two lateral diverge and run round the peri- 

 phery of the septum. The existence of this central Strand is regarded 

 as affording important evidence in favour of the axial theory of the 

 "sporophyll" in the Psüotales and it is held to represent the vascular 

 supply of the apex of the branch. It is concluded that the fertile 

 branch is an axis bearing two leaves or a Single dichotomous leaf 

 and terminating in an apical synangium formed from one or two 

 masses of sporogenous tissue which have become fused over the 

 apex of the branch. 



The question is also raised as to the possibility of regarding 

 the sporophylls of the Sphenophyllum as being organs morphologi- 

 cally equivalent to branches bearing leaves and sporangia, the 

 branch axis being much reduced or wanting. 



D. T. Gwynne-Vaughan. 



Bonati, G., Sur quelques Pediculaires chinoises nouvelles. 

 (Bull. Soc. bot. France. T. LV, p. 242—248 et 310—314. 1908.) 



Description de douze especes nouvelles recoltees par le R. P. 

 Soulie ä Zambala et ä Yargong dans le Thibet meridional: 

 Pedicularis latituba, P. Garniert, P. heterophylla, P. aqiiilina, P. 

 Duclouxii, P. rmnosissima, P. dichotorna, P. Pheidpini, P. niidicaulis, 

 P. Steiningeri, P. yargongensis, P. dancijolia; l'auteur mentionne en 

 outre deux especes nouvelles du Hupeh, qui seront decrites dans 

 le Bulletin de l'herbier de Kew, P. pteridijolia et P. sparsißora. 



J. Offner. 



Finet, E. A., Orchidees nouvelles ou peu connues. II. (Bull. 

 Soc. bot. France. T. LV, p. 333-343. 2 fig. pl. X et XL 1908.) 



Especes nouvelles: Microstylis liparidioides de l'Equateur et du 

 Perou, Oberonia Cavaleriei de Chine, O. Regnieri de Cochinchine, 

 0. Beccarii de Borneo, Oreorchis coreana de l'lle Quelpaert,Lzj^«m 



