FERN. 1 1 



a few of the ordinary epidermis-cells sur- 

 rounding. 

 2. In a prepared vertical section of a leaf note : 



(a) The epidermis-cells of upper and lower 



surface. Look for stomata and guard- 

 cells. 



(b) Mesophyll-oells containing much chloro- 



phyll. These cells are arranged near 

 the upper surface of the leaf in com- 

 pact layers, but near the lower surface 

 they are irregularly placed, with air- 

 spaces between them. 



(c) Transverse or oblique sections of the 



fibrovascular bundles. 

 Sketch a part shoiving (a) and (b). 

 IV. Asexual Reproductive Organs. 



1. Examine a part of the sorus with a low power 



without a cover-glass. 



It is composed of a number of oval 

 bodies : the sporangia, covered by the in- 

 dusium. Sketch. 



2. Remove some of the sporangia, mount in water \ 



examine ivith high poiver, and sketch. Note : 



(a) Form : biconvex bodies, borne on short 



stalks. 



(b) Structure : flat cells, with one row thick- 



ened to form a prominent ring (annulus) 

 around part of the capsule. 



