Clark ; Hepaticae from the state of Washington 303 



in diameter, have distinct trigones. It is also paroicous in its in- 

 florescence while A^ Breidleri is dioicous. In both species the 

 perigynium bears a rudimentary sac at the base, differing in this 

 respect from all our other species of the genus. 



Jungermannia AUenii sp. nov. 



Brownish green or reddish, growing in tufts : stems 1.5—3 cm. 

 long, 0,15-0,25 mm. in diameter, ascending or suberect, sparingly 

 branched, the branches arising close to the postical end of the 

 line of attachment of the leaves; rhizoids few or wanting, not pig- 

 mented : leaves distant to subimbricated, obliquely inserted, some- 

 what concave, slightly decurrent, oval to subrotund, I -1.5 mm. 

 long, 0.8—1.35 mm. wide, undivided or slightly emarginate, entire, 

 bordered by a row of more deeply pigmented cells ; median leaf- 

 cells from 20-30// in diameter, trigones large and distinct, cuticle 

 striolate : underleaves sometimes minute and fugacious, sometimes 

 large and persistent, mostly 20-40 fj. In length and bearing nu- 

 merous hyaline papillae, the large ones occasionally attaining a 

 length of I mm,, sometimes undivided, sometimes variously bi- 



lobed or bifid : inflorescence dioicous. [Plate 20, figures i-i i .] 

 On rocks, more or less submerged. Paradise Valley, Mount 

 Ranier, Allen^ Flett. Professor Allen's specimen, which may be 

 considered the type of the species, is deposited in the herbarium 

 of A. W. Evans, at New Haven, Connecticut. 



The specimens examined are all sterile with the exception of 

 a single plant bearing a very immature female inflorescence. On 

 the basis of this plant the species is assumed to be dioicous. Un- 

 fortunately in the absence of mature floral organs, the generic 



w 



position cannot be definitely determined. The reddish pigmenta- 

 tion, which is sometimes very marked, points perhaps to Nardia 

 or Jamesofiiella, but it seems wisest to retain the species in Junger- 

 mannia, at least for the present. In habit and in size it somewhat 

 resembles^, cordifolia Hook., which is not uncommon in Washing- 

 ton, although it has not before been recorded from the state. In this 

 species, however, the pigmentation is never reddish, the leaf-cells 

 are wholly destitute of trigones, and there are no underleaves. In 

 Nardia compressa (Hook.) S. F. Gray, with which the new species 

 may also be compared, the two rows of plane or slightly concave 

 leaves are laterally appressed to each other, the cuticle is smooth, 

 and the underleaves are uniformly minute and triangular. The 



