86 MOSS. 



alcoholic specimens showing male and female flowers, 

 and fruit ; fresh specimens showing protonema and male 

 flowers ; potassic hydrate ; and iodine. 



LABORATORY WORK. 

 GROSS ANATOMY. 



A. GENERAL CHARACTERS. Note 



1. The vertical stem ; unbranched, or branching only from 

 the base. 



2. The leaves clothing the stem. 



3. The root-hairs, rhizoids ; often forming a close felt at 

 the base of the stem. 



4. At the summit of some of the stems, Deflowering heads 

 of two sorts : 



a. The male heads forming a terminal rosette of green 

 leaves. 



b. The female heads with the terminal leaves folded 

 over each other forming a small bud. 



5. At the summit of other stems the fruit or sporogoniuni, 

 consisting of 



a. The slender stalk or seta. 



b. The cylindrical pod or capsule. 



c. The hood which fits closely over the end of the 

 pod, and may be easily pulled off, or has dropped 

 off of itself, the calyptra. 



6. Among thrifty plants that have been kept under a 

 moist bell jar for several days, notice the green threads 

 growing out over the soil, the protonema. 



B. THE RHIZOIDS. Remove some from the stem, 

 mount, and notice the small tangled hairs forming the mass. 



