﻿236 Grout : A Revision of the 



In the 50 or more specimens of each species that I have ex- 

 amined I have been unable to see that there is any difference in 

 this respect. 



All leaves distant. Stem leaves distant, branch leaves close. 



There is a great variation in this respect in the plants referred 

 to both species but I can detect no perceptible difference between 

 the European E. pradongum (Hedw.) and the American E. Mans. 



Cells of stem leaves 5-8 : 1. Cells of stem leaves 7-12 : I. 



There is also a great variation in this respect in both, but no 

 constant difference, and this variation does not seem to be correlated 

 with the variations in the shape of the leaves. 



Branch leaves almost plane. Branch leaves very concave. 



There is absolutely nothing in this distinction. The leaves of 

 either may be plane or concave and there are great differences in 

 this respect even on the same plant. 



Perichaetial leaves faintly costate. Perichaetial leaves ecostate. 



Sullivant (Icones Muscorum, 163) says of E. Mans; " Perichae- 

 tial leaves subcostate." There are faint but distinct traces of a costa 

 in some or all of the perichaetial leaves in most of the E. hums I 

 have examined. Mr. Dixon writes me that the perichaetial leaves 

 of the British plant referred to E. praclonguin Hedw. are often 

 ecostate. 



Seta purple. Seta red. 



This also does not hold. 



Annulus persistent. Annulus easily detachable. 



I have not tried to verify this because it involved so much mu- 

 tilation of specimens. It is a very doubtful distinction to say the 

 least. 



Seta 15-25 mm. long. Seta 10-13 mm. long. 



The seta of the European plant does seem to average a little 

 longer, but there are plenty of specimens of American E. kiatis 

 with seta 15-25 mm. long. So far as can be determined the length 

 of the seta is not correlated with any of the other characters 

 given as distinguishing. 



Capsule strongly contracted under the Capsule not at all contracted under the 

 mouth when dry. mouth wh . 



I could distinguish absolutely no differen 



Spores faintly roughened. Spores smooth. 



pect 



