EXPLANATION OF PLATE II. 



11.1 ISTRATIONS IN MINUTE ANATOMY. 



Fig. 7. One of the pair of fibro-vascular bundles in a leaf of 

 Pinus, x 400 :/ phloem, .r xylem, sv group of spiral vessels (in 

 other bundles they are often more scattered), ;// ;// rows of paren- 

 chyma cells forming medullary rays containing starch in the xylem 

 and protoplasmic substances in the phloem, r resin duct, f f 

 fibrous tissue with thick walls, small cavities and prominent middle 

 lamellae,/' fibrous cell with lateral pjt,/^ thin-walled parenchyma, 

 // /;' parenchymatous tracheides with bordered pits, tr' face view 

 of the pits on an end wall. The other bundle of the same leaf was 

 at the left side of this one. Drawn with pen. 



Fig. 8. Diagrammatic drawing of a vertical section of leaf of 

 Capsella showing a sorus of Cystopus, X ico : ue upper epidermis, 

 le lower epidermis,/ palisade parenchyma, s spongy parenchyma, 

 fb small fibro-vascular bundle, h hyphae passing between the pali- 

 sade cells and terminating in c the conidiophores which bear the 

 chains of conidia c' . The epidermis is raised, but not yet ruptured, 

 above the sorus. Drawn with pen. 



Fig. 9. Cells of Protococcus after treatment with chlor-iodide 

 of zinc, X 430 : w the thick cell wall, c large chlorophyll bodies, 

 ;/ nucleus with central nucleolus. Drawn with pencil. 



Fig. 10. Diagrammatic drawing of a transverse section through 

 the ovary of Trillium showing one entire carpel, which is shaded, 

 and a portion of the other two, X 12: ww the pair of wings,// the 

 three placentas meeting in the center of the ovary, x xylem and p 

 phloem of the fibro-vascular bundles of which each carpel has one 

 between the wings and one in each placenta, o ovule which re- 

 ceives a branch from the fibro-vascular bundle of the placenta to 

 which it is attached. Drawn with pencil. 



Fig. ii. Diagram to illustrate the theoretical carpellary struc- 

 ture of Trillium, representing a single carpel in transverse section 

 as in fig. 10, and with the same lettering. Drawn with pen. 



