60 CONTRIBUTIONS TO THE BRYOLOGY 



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



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

 ceolatis immarginatis integerrimis, costa sub apice dissoluta; cap- 

 sula terminali subobliqua vel erecta ; operculo conico-rostellato ; 

 calyptra cucuUiformi ; Acre masculo terminali. 



Species prsecedente dimidio major, folia minus elongata immargi- 

 nata, capsula saepius insequalis 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. SCHISTIDIUM SERRATUM, Hook. ^ Mis. 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. 



