Best : North American Pseudoleskea 223 



variety, var. graeilior, of P. radicosa and that this species, "a good 

 Pseudoleskea" connected Pseudoleskea with Lescnraea. As recog- 

 nized in this Revision the Pseudoleskeas constitute an unbroken 

 series more closely related, as they should be, by their sporophyte 

 characters than by their gametophyte. 



In this connection it is impossible to make mention of the 

 many favors of which I have been the recipient while engaged in 

 the preparation of this monograph. My grateful acknowledg- 

 ments however are due Mrs. Britton for invaluable assistance and 

 unnumbered kindnesses and Mr. R. S. Williams for the care with 

 which he has executed the drawings. For valued contributions, 

 types, specimens, notes, my sincere thanks are due Prof. John 

 Macoun, Mr. H. N. Dixon, Mr. Jules Cardot, Dr. B. L. Robin- 

 son, Dr. M. A. Howe, M. Eugene Autran, Mr. A. Gepp, Mr. J. 

 B. Leiberg, Rev. A. C. Waghorne, Prof. J. M. Holzinger, Mr. 

 R. S. Williams and Mr. C. E. Faxon. 



PSEUDOLESKEA Bryol. Eur. 5: 1852. In part 



Plants small to medium size growing on rocks, stones, bases of 

 trees, rarely on rotten wood or the ground, in mountainous re- 

 gions. Stems radiculose, pinnately branched, central strand none 

 or rudimentary ; branches simple, usually recurved at tips ; para- 

 phyllia numerous, mostly linear-lanceolate ; leaves papillose or 

 smooth, entire or serrulate above, biplicate, ovate-lanceolate, acu- 

 minate, costate, margins more or less recurved ; leaf cells quadrate- 

 hexagonal to linear-rhomboidal ; capsules erect or inclined, straight 

 or curved, pachydermatic, air spaces none, stomata few at base 

 and functionless ; exostome well developed, teeth confluent at base 

 into a colored basal band of the same texture ; endostominal band 

 i- to ^ the length of the teeth ; segments as long as the teeth ; 

 cilia poorly developed ; calyptra cucullate. 



Braithwaite* and some others reduce Pseudoleskea to a sub- 

 genus under Leskea. This reduction is probably based on insuf- 

 ficient data. The species of Pseudoleskea are usually stouter 

 plants, the leaves more strongly recurved on their margins and the 

 areolation longer and narrower. The peristomes moreover show 

 a higher grade of development, the exostomes have a distinct 

 basal band and the exothecial cells are quadrate and thick-walled. 



* Brit. Moss. Flora, 3 : 9. 1896. 



