EPHEMERUM. 26< 



* Ephemerum intermedium Mitt. (Tab. XXXVII. H.). 



Differs from E. serratum in the presence of a faint nerve in 

 the upper part of the leaf, very thin and obscure, and vanishing 

 above the middle, but occupying the greater part of the point 

 upper cells narrower, rather long. 



Hab. Fallow fields, Sussex ; very rare. Fr. late autumn. 



The difference between this and E. serratum depending entirely upon the nerve, 

 which is sometimes extremely faint, and in the lower leaves always wanting, and upor 

 a slight difference in the width of the cells, which are somewhat variable in E. 

 serratum, I have thought it best to consider E. intermedium as a sub-species only o; 

 the former. The nerve is chiefly recognisable by the deeper chlorophyllose coloui 

 it gives the apex of the leaf. 



2. Ephemerum cohserens Hpe. (Phascum cohaerens Hedw 



(Tab. XXXVII. I.). 



Stems closely tufted, protonema bright green, becoming 

 discoloured when older. Leaves oblong-lanceolate or ovate-lanceo- 

 late, shortly pointed, serrated in upper part ; nerve thin, reaching 

 apex or vanishing just below ; cells rhomboid-hexagonal, rather 

 smaller than in E. serratum, but larger than in the two following 

 species. Calyptra lobed or torn at base. Fruit as in the previous 

 species. Dioicous. 



Hab. Moist banks ; near Portumna, Galway (Moore). Fr. late autumn. 



Differing from the next in the broader, more serrated leaves and not or indistinctly 

 excurrent nerve ; from E. recuruifolium in the more lanceolate outline of the leaves, 

 shorter nerve and larger cells. The apex of the leaf is often slightly oblique or 

 recurved. 



3. Ephemerum sessile Rabenh. (Phascum sessile B. & S., 

 Ephemerum stenophyllum Schp., Syn., Braithw. Br. M. FL, &c ) 



(Tab. XXXVII. J.). 



Rather taller than E. serratum, with longer leaves, the upper 

 lanceolate-subulate, gradually tapering to a narrow point, very 

 slightly serrulate at apex ; nerve thin at base, broad (about \ 

 width of leaf at base), slightly excurrent. Cells small, irregularly 

 rectangular-rhomboid, incrassate. Calyptra torn at base. Fruit 

 as in E. serratum. Autoicous. Male flower at the base of the 

 stem. 



Var. fit. brevifolium Schp. Leaves shorter, nearly entire; 

 nerve less excurrent. 



