THE BRYOPHYTES 



269 



345. Minute Structure of the Male Receptacle and Antheridia. — 



Make thin vertical radial sections (in pith) of a male receptacle and 



examine with l.p. and m.p.^ 



Note: 



(n) The flask-shaped 

 cavities in which the an- 

 theridia are borne. Where 

 do they open ? 



(b) The antheridia of 

 various ages, each with a, 

 stalk bearing a sperm-case. 



(c) In water in which a 

 fresh male receptacle has 

 been left for a short time 

 look with l.p. for moving 

 sperms. Kill them with 

 iodine, run water under the 

 edge of the cover-glass, 

 study, and draw. Or crush 

 a mature antheridium from 

 preserved material and 

 study the sperms. 



346. Minute Structure of 

 the Female Receptacle and 

 Archegonia. — Cut thin ra^ 

 dial vertical sections (in 

 pith) of young female recep- 

 tacles, making the sections 

 pass through the portions 

 between the ravs, or arms. 



Fig. 104. Female 

 Receptacle of 2Iar- 

 chantia (lengthwise 

 section, consider- 

 ably magnified). 



c, canal in neck of archegoniiun ; e, egg in 

 archegonium ; p, breathing pore ; chl, cells, 

 in air-chamber, containing chlorophyll; /, 

 lobe of the receptacle ; s, fringed appendages 

 of receptacle. 



If possible use also prepared slides of microtome sections. Examine 

 with m.p. and note : 



(a) The archegonia of various ages. Where are the youngest ? 



(b) The parts of an archegonium, — a short, stout stalk, an en- 

 larged body, or venter, and a slender neck. Draw. 



(c) Inside of the venter in the older archegonia an egg. Draw. 



1 Prepared slides of microtome sections will show the relative positions of 

 the parts more clearly. 



