MOSS. 77 



A. Male Plant. Sketch. 



With a razor make longitudinal sections of the 

 flowering head. Mount in ivater and observe at 

 the apex of the axis within the perichcetial leaves : 



(a) Antheridia : oblong sacs with a wall of a 



single layer of cells. Within the sacs 

 are mother-cells of antherozoids. 



(b) Filaments (paraphyses). 



(aa) Hairlike. 

 (bb) Spatula-shaped. 



Sketch an antheridium from the surface and in op- 

 tical section. 

 Sketch each kind of paraphysis. 



B. Female Plant. Sketch. 



With needles separate the leaves from the, top of the 

 axis of the female flowering head and search for: 



(c) Archegonia : flask - shaped bodies with 



elongated neck and enlarged ventral 

 part containing the oosphere. 



(d) Paraphyses. 

 Sketch. 



B. ASEXUAL GENERATION. (Sporophore.) 



Observe : 

 I. General Characters. 



1. The slender stalk, seta, which supports : 



2. The capsule, which contains the spores. 

 Sketch. 



The parts of the capsule : 



(a) The thick hairy cap, calyptra. 



