_ 20 MOSS. 



41. External Features. Draw under the hand lens a moss-plant with sporogonium, 

 showing : rhizoids ; stem ; leaves ; sporogonium, with seta, theca, and calyptra. 



42. Leaf. Mount a leaf in water and draw it under the low power, showing : midrib ; 

 lamina ; cells. Then draw a few cells under the high power to show contained chloroplasts. 



43. Stem. Draw a transverse section of the stem under the high power to show : 

 conducting strand ; thin-walled cortex ; thick-walled cortex ; epidermis, and in some 

 slides, rhizoids and sections of leaves, 



