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POLYTRICHIA COMMUNE L. 



i — Male and female plants, about one-half natural size. 2 and 3.— Capsules 

 with and without calyptra 4. — Mouth of capsule, enlarged, s- — Teeth 

 of peristome, greatlyenlarged. 6.— Antheridium and paraphyses. great- 

 ly enlarged. 7.— Leaf, enlarged. 8 —Margin of leaf enlarged to show 

 tooth and cells. 10.— Cross-section of leaf to show lamella^ on upper sur- 

 face. 9.— Lamelke. greatly enlarged. 



Taken by permission from Mrs E. G Britton's "Mosses of the Eastern Uni- 

 ted States." ( in preparation). 



ridium (fig 6). The antheridia are borne on separate plants in 

 terminal rosettes (fig 1). Both antheridia and archegonia grow 

 intermingled with slender hairs called paraphyses (fig 6). 



Returning to the capsule we shall find, if our plant is mature, 

 that at the top of the capsule there is a lid or operculum (fig 3). 

 which can be pulled off and which lets the spores escape. A strong 

 dissecting microscope will be needed to see the antheridia and 



