6 (60) CONTRIBUTIONS TO THE BRYOLOGY 



3. FISSIDENS EXIGUUS, Suttiv. Muse. Alleghan. n. 182. 



F. animus, dioicus; caule simplici; foliis 5-9-jugis oblongo-lan- 

 ceolatis immarginatis integerrimis, costa sub apice dissoluta ; cap- 

 sula terminal! subobliqua vel erecta ; operculo conico-rostellato ; 

 calyptra cuculliformi ; flore masculo terminal!. 



Species praecedente dimidio major, folia minus elongata immargi- 

 nata, capsula saepius inaequalis subobliqua, sporae minores. 



It grows with the preceding species, and fruits at the same time. 



TAB. II. B. Fig. 1. Plants of the natural size. Fig. 2. Point of the 

 leaf. Figs. 3, 6. Capsules. Fig. 4. Calyptra. Fig. 5. Female plant. 

 Fig. 7. A leaf. Fig. 8. Antheridia. Fig. 9. Male plant. Fig. 10. Sec- 

 tions of leaves. Fig. 11. Spores. All magnified. 



4. SCHISTID1UM SERRATUM, Hook, fr Wils. in Drum. 

 Muse. Amer. n. 20. Muse. Alleghan. n. 198. 



This plant may be regarded as a highly developed state of the 

 European Phascum patens ; from which it is distinguished mainly 

 by the firmer texture of the outer thecal membrane, and by a re- 

 duced form of opercular dehiscence. Its globose capsule separates 

 at maturity into two equal portions by a circumscissile line, of 

 which no traces are visible during the early stages of the plant, and 

 no alteration, other than a slight discoloring of the cells near the 

 line of separation, takes place ; thus exhibiting an imperfect form 

 of dehiscence in a moss of the operculate division. 



The accordance of this plant with Phascum patens appears to be 

 complete in all other important respects. 



