144 
A. G. Tansley. 
is the Lindsaya- type, characteristic, though not exclusive, in the 
genus Lindsaya, and also found in Davallia ( Odoiitoloma ) repens. 
Lindsaya is a tropical genus showing a preponderance of shade- 
forms and with an unmistakably “mixed” sorus; it is usually 
placed in a separate family Lindsayete, closely allied to the 
Davallieae, and, by its foliage and the position of its sorus, to 
Adianteae also. Gwynne-Vaughan’s work (’03) has shown that 
certain species which are placed by Hooker and Baker (Synopsis 
Filicum) in the genus Davallia, agree closely with the Lindsaya- 
type of anatomy, and since these species have all been put, at 
various times, by one authority or another, in separate genera, and 
their general characters also sufficiently agree with Lindsaya, we 
Fig. 43. Lindsaya scandens. Scries through node, showing internal 
phloem and mode of attachment of leaf-trace. 
seem fully justified in associating them under separate generic 
names in the family of Lindsayeac. 
The internode of a typical Lindsaya (Tansley and Lulham ’02) 
shows a dorsiventral stele with mainly “ solid ” xylem, hut with an 
internal strand of phloem running close to its dorsal surface (Fig. 
43D). The xylem has a good deal of intermixed parenchyma, as in 
Gleichenia, hut no spiral protoxylem. 
The pctiolar strand is “ subrotund or cordate ’’ in cross section, 
the xylem consisting of two more or less distinct arms inclined to 
