M'Ardle — On the Musci and HepaticcB of the Co. Cavan. 617 



EXPLANATION OP PLATES XXI. and XXII. 



Plaie XXI. 

 Scapania aspera, MiiU. 



Fig. 1. Plant, twice natural size. 



2. Portion of a branch, with perianth, ventral aspect, x 10. 



3. The same dorsal aspect, x 10. 



4. Perianth and involucral bracts, x 15. 



5. Young shoot, bearing gemmse buds at apex, x 10. 



6. Leaf, x 16. 



7. Involucral bract, x 16. 



8. Cells and margin of leaf, x 275. 



Plate XXII. 

 Met%geria conjugata, Dill., Lindberg. 



Fig. 1. Plant, natural size. 



2. The same, x 10, showing monoecious character. 



3. The normal branching habit of the plant. 



4. Proliferous budding frequently seen in Metzgeria. x 10. 

 6. The setulose calyptra or perianth, x 20. 



6. The same, with elevated capsule and involucre, which 



encloses the antheridia. x 20. 



7. Involucre, which encloses the antheridia. x 120. 



8. Yalve of the capsule and persistent elaters (one spired). 



x 120. 



9. Portion of thallus or frond showing marginal hairs, x 120. 



