1043 
Trichomanes javanicum , BL 
presence in both groups of vestigial axillary branches. The Botryopterideae 
and Hymenophyllaceae show great similarity in anatomy, and also possess 
vestigial axillary branches found in an increasing number of forms. It is 
obvious then that the Ophioglossales, Botryopterideae, and the Hymeno¬ 
phyllaceae are in one circle of affinity. 
I wish to thank Dr. M. Benson for the material she has placed at my 
disposal, and for her helpful criticisms during the investigation recorded in 
this paper. 
DESCRIPTION OF FIGURES IN PLATE LXXX. 
Illustrating Miss H. S. Chambers’s paper on the Vestigial Axillary Strands of 
Trichomanes javanicum. 
Fig. i. Transverse section of a meristele given off from the rhizome. The xylem shows central 
protoxylem (px) and is surrounded by phloem (ph), pericycle (pr), and endodermis. x 180. 
Fig. 2. Transverse section of the meristele, showing the xylem of the axillary branch (a) just 
separated from the leaf-trace (/) by a layer of parenchyma (p). X 125. 
Fig. 3. Transverse section of the leaf-trace after the axillary strand has separated, showing the 
first signs of the change from radial to dorsiventral structure. The two groups of protoxylem {px) 
are near the flattened side of the leaf-trace, x 125. 
Fig. 4. Section of the axillary strand separated from the leaf-trace by a distance of 0*075 mm * 
X 180. 
Fig. 5. The same at a distance of 0-16 mm. from the leaf-trace, x 180. 
Fig. 6. The same at a distance of 0*23 mm. from the leaf-trace, x 180. 
Fig. 7. Section of the mass of parenchyma representing the last stage in the axillary strand 
when it is situated in the tongue of tissue on the adaxial surface of the petiole, x 180. 
