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FOl.YTRICHUM 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. 5. — Teeth of peri- 

 stome, greatly enlarged. 6. — Antheridium and paraphyses, greath' enlarged. 

 -Leaf, enlarged. 8. — Margin of leaf enlarged to show tooth and cells. 



10. — Cross-section of leaf to show laniellie on upper surface. 



. — l.ainellce, 



greatly enlarged. 



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

 States." (in preparation). 



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

 terminal rosettes (fig i). 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 



