250 



BULLETIN OF THE UNIVERSITY OP WISCONSIN. 



Perichaetial leaves ecostate. 1 



Plicate 



Not plicate. 



Foliage leaves strongly revolute 

 Foliage leaves concave . , 



H. plicatile, 394, 



H. revolutum, 8 566. 

 H. Sequoieti, 392. 



H. rugosum, 388. 

 H. robust urn, 388. 



H. loreum, 410. 

 H. triqnetrum, 4 409. 

 H. squarrosum, 5 409. 



HYLOCOMIUM, 3 p. 409. 



Leaves secund. 



Sharply serrate at apex, alar cells quadrate 

 Subserrate at apex, alar cells scarcely different 

 Leaves equally spreading. 

 Paraphyllia none. 

 Leaves sulcate. 

 Ecostate, leaf cells all alike 

 Bicostate, leaf cells enlarged at the base 



Leaves not sulcate 



Paraphyllia present. 



Leaves with a long double costa and deeply sulcate H. umbratum, 407. 

 Leaves obscurely bicostate. 



Paraphyllia pinnate, branches 2-3 pinnate H. splendens, 407. 

 Paraphyllia minute, branching irregularly pin- 

 nate H. brevirostre, 408. 



Leaves unicostate to middle, coarsely serrate . H. Oakesii, 408. 



1 //. pseudo-fastigiatum, C. M. & Kindb., Appendix, no. 563, and H. pseudo-pratense 

 Kindb., Appendix no. 578, both described from sterile specimens, fall here. 



2 See also Appendix, no. 567. 



3 Including Pleurozium L. & J. Man. 407. 



4 See Appendix, no. 603. 



6 See Appendix, no. 602. H. calvescens (Wils.) Lindb. is closely related to H. squar- 

 osum and is ranked as a variety by Husnot: Muscol. Gall. 425. 



