96 ANTHOCEROS. 



4. Rhizoids: number and distribution. 



5. Draw. 



6. Sporophytes arising from the thallus. Note especially the 

 form and relative size of all parts of the sporophyte, and 

 whether its tip is split or entire. 



7. Draw. 



MINUTE STRUCTURE. 



I. VEGETATIVE STRUCTURES. 



By use of sections of the thallus cut at right angles to the 

 surface and parallel to the midrib observe: 



1. The relatively simple structure of the thallus. 



a. Number of cells in thickness at midrib and margin. 



b. Absence of epidermal tissue. 



2. Origin of rhizoids. 



3. Draw. 



II. SEXUAL REPRODUCTION. 1 



1. Archegonia and antheridia, somewhat similar to those of 

 Riccia, though the antheridia arise from within the 

 gametophyte tissue (endogenous). 



2. The oospore beginning to germinate to form the sporo- 

 phyte. 



3. Draw. 



III. ASEXUAL REPRODUCTION. 



1. The base of a well-developed sporophyte. Note especially 

 the foot, with its rhizoid-like processes which penetrate 

 the tissues of the thallus. 



2. Draw. 



By use of a section cut lengthwise through the sporophyte 

 observe : 



1 Owing to the difficulty of observing these points, prepared slides spe- 

 cially stained are indispensable and should be used as a means of 

 demonstrating the structures mentioned in i and 2. 



