Pteridophyten. 355 



distance, while in two more it was complete for a considerable 

 dislance above and below a leaf gap. The endodermal markings of 

 the cells of the internal endodermis appear, as does the reparatory 

 band formed in connection with the youngest trace, before the 

 traces separate. 



Dr. Lang recognizes the secondary xylem of Botrychium, but 

 points out that though the primary xylem is the lirst to be lignified 

 behind the apex yet the procambial divisions of the cells outside 

 the primary xylem are in the main completed close the apex, though 

 these radial rows only become lignified later. Thus the formation 

 of secondary xylem does not proceed indefinitely, though under 

 special circumstances the meristem may resume the formation of 

 fresh xj^lem elements. It would also appear that there is frequently 

 some centripetal xylem in the stem, even in the adult meduUated 

 region, though the absence of definite protoxylem, except in con- 

 nection with the formation of a leaf trace makes it difficult to be 

 certain, The leaf trace may, when departing from a stem with well 

 developed secondary xylem, possess secondar}^ xylem, but always 

 loses it before leaving the stem; the trace is endarch at its origin 

 and probably remains so for though adaxial tracheides often appear 

 especially in the cortex, they seem not to be centripetal xylem but 

 an adaxial completion of the centrifugal xylem. On this view the 

 incurved ends of the widely spread C-shaped trace of the Ferns 

 might be regarded as the last indication of the centrifugal adaxial 

 xylem. 



BotyycJiiuni Limaria has a vestigial axillary bud related to ev^ery 

 leaf and occasionally these become active producing branching 

 plants; the vascular supply of these branches may appear to come 

 almost wholly from the adaxial side of the subtending leaf trace, 

 or it may come in considerable part from the stele. In one branched 

 specimen a considerable number of internal tracheides were found 

 in the pith of the stem and branch steles near their point of con- 

 nection. Isabel Browne (University College London). 



Maxon, W, R., A new genus of davallioid ferns. (Journ. 

 Washington Acad. Sei. III. p. 143—144. March 4, 1913.) 



The writer points out that the genus Odontosoria, as delimited 

 in the Natürlichen Pflanzenfamilien, consists of two well marked 

 sections which are really entitled to rank as distinct genera; that 

 the name Odontosoria must appU^ to those species with long, scan- 

 dent fronds of indeterminate growth, rather than to the species 

 with small erect fronds; and that the latter group of species must 

 bear a new name, Sphenonieris Maxon, gen. nov. The genus Sphe- 

 norneris is then described, with 5. clavata (L.) Maxon {Adiantuin 

 clavatum L.) as its type. Two Old World species are also mentioned: 

 S. retusa (Cav.) Maxon (Davallia reiusa Cav.) and 5. chinensis (L.) 

 Maxon (Adiantum chinense L.), both of these agreeing closely in 

 habit with 5. clavata. Maxon. 



Maxon, W. R., On the identity of Cvathea niultiflora, type of 

 the genus Hemitelia R. B r. (Bull. Torrey Bot. Club. XXXVIII. 

 p. 545—550. pl. 35. Dec. 1911.) 



The name Cyathea multifloya J. E. Smith, given originally to 

 certain specimens said to have been coUected in Jamaica b}^ 



