Ephemerum.] ERYACE^. 37 



1. Plants stemless,from a more or less persistent prothallium. 



1. MIOROMITRIUM, Aust. 



Plants scarcely visible without the glass. Leaves ecostate. 

 Inflorescence syncEcious. Cajjsule globose, apiculate or point- 

 less. Calyptra very small, closely adherent. Spores few, large. 



Scarcely distinct from Ephemerum. 



1. M. megalosporum, Aust. Leaves broadly ovate 

 lanceolate, obtusely serrate : capsule pale, globose, apiculate ) 

 vaginule large, ovate, truncate ; calyptra concentric : spores 

 nearly smooth. — Muse. Appal, n. 47 ; Sulliv. Icon. Muse. Suppl. 

 20, 1. 11. Ephemerum teiieriim, Bruch ; Bryol. Eur. 1. 1. Nano- 

 mitrium teiierum, Lindb. Manip. Muse. ii. 409. 



Hac. On broken clayey ground, with the following; very rare [Austin), 



2. M. Austini, Aust. Leaves oj^en, recurved, lingulate- 

 lanceolate, remotely serrate in the upper part : capsule apicu- 

 late ; calyptra concentric : spores slightly papillose, of \ the 

 diameter of the preceding. — Muse. Appal, n. 45 ; Sulliv. Icon. 

 Muse. Suppl. 21, t. 12. Ephemerum Austini., Sulliv. Ms. 



Hab. Wet ground in woods ; Closter, New Jersey (J.u.sit)i). 



3. M. synoicum, Aust. Much like the last : leaves longer, 

 more distant, erect, obscurely serrulate : capsule pointless, 

 sometimes in pairs in the same pericliaetium ; calyptra gen- 

 erally excentric or on one side of the capsule : spores a little 

 smaller and papillose. — Muse. Appal, n. 46 ; Sulliv. Icon. 

 Muse. Suppl. 22, t. 13. Ephemerum synoic'um, James, Trans. 

 Am. Phil. Soc. (1865), 106 ; Sulliv. & Lesq. Muse. Bor.-Am. 

 (2 ed.), n. 27. 



Hab. Sides of ditches in clayey ground near Camden, New Jersey, 

 and around Philadelphia (James). 



2. EPHEMERUM, Hampe. 

 Pseudo-dioecious. Flowers gemmiform ; female buds gre- 

 garious upon the same prothallium. Calyptra campanulate. 

 Capsule globose-ovate, apiculate. Leaves nerved, except in the 

 first sijecies. Plants slightly stouter. 



* Leaves not costate. 

 1. E. serratum, Hampe. Prothallium dark green : leaves 

 oblong or lanceolate-acuminate, coarsely and irregularly serrate 



