I AMY 



SUMMARY 



thallus in the two M gemi% I*aJUvicmu differ* in 



In the *. ic wings are but une crt 



Tcnia the merges gradually into the 



wings, as i* tiu- . .IM- m Morkia and Calycularia. In Mittenia abo. there 

 is a marked < .vem the prostrate, rhizome-tike portion of the 



thallus and t iaped green branches. In the latter alio. 



Mtious branches from the rhixome i* more cnmmoa 

 th in in the >|*cies of KujKillavioinia 



ii the three secies considered in thi% fajicr it a 



two-- .it of \neura or Met/^ena. These species differ 



in this temped fr- where the apical cell U a three-sided 



inner 1 1 ) ). Pallaiicinin cylindrico (Campbell |i | i. may have 

 a two > ell. hut more commonly it appears oblong when ** 



igeb |i). has 

 < d apical cell. 



The hooked marginal teeth, found in Mittenia. are probably com- 

 parable to the leaf-like lobes of certain species of Symphyogyna. and like 

 them bear a definite relation to the segments of the apical cell 



4. The position of the antheridia in the three species studied differs 

 somewhat from the descriptions given by Schiffner [2). In /' ( .t/ilfswai) 

 Zollittgeri they cover the whole surface of the midrib, as they do in lldr- 



In the related species. P. dccipiens. they are <aid by Fanner (l) to 

 form a row on each side of the midrib. In P. Lfiifii they occur in a row 

 on ea <f the midrib, and not on its upper side. In /' rofimlaM 



the presence of sterile areas between the groups of antheridia seems to 

 have been overlooked by previ>u< students of this species. 



5. The development of the antheridium is much alike in all the 

 species, and conforms to the usual type found in the Jungermanniales. 



fx The spermatogenesis corresponds to that found in other Hepatkae. 

 A delicate membrane separates the pairs of spermatocyte*. as in Fos- 

 sombronia and Calycularia It is |>ossible that a "N f ebenkorper. M like Out 



1 1 > and for Fossombronia ( Humphrey 



1 1 1 i may be present, but this \\as not certainly demonstrated. Woodburn 

 ( i ) Mieves that such a body is not present in the spermatoxoid. The 

 number of chromosomes is probably eight 



