Evans: Notes on genus Herberta 221 



1843, A. Gray & W. S. Sullivanl (distributed, as Schisma juniperi- 

 nuni, in Sullivant's Muse. Alleg. 2^8, and listed by Sullivant, as 

 Sendtnera juniperina, in A. Gray, Man. 689. 1848); top of 

 Black Mountain, June, 1850, L. Lesqiiereux; Grandfather Moun- 

 tain, August, 1891, J. K. Small J2 (also distributed, as H. adunca, 

 in Underwood & Cook's Hep. i\mer. 126) ; Grandfather Mountain, 

 September, 1901, G. F. Atkinson 11420, 11 501 (listed by Andrews, 

 as H. adunca, in Bryologist 17: 59. 1914); near ShuUs Mills, 

 Blue Ridge Mountains, September, 1901, G. F. Atkinson 12054 

 (listed by Andrews, I.e.). 



Dr. Small's specimen from North Carolina, No. 32, may be 

 designated the type. 



Two additional records for H. adunca from the eastern United 

 States may likewise be noted, namely: Carbon County, Pennsyl- 

 vania, E. A. Rau (listed by Porter in Cat. Bryoph. & Pteridoph. 

 Pennsylvania 9. 1904), and mountains of western North Carolina, 

 1907, A. J. Grout (listed by Grout in Bryologist 12: 54. 1909). 

 In all probability these records were based on H. tenuis. 



The present species is closely related to H. Hutchinsiae but is 

 considerably smaller. Although at first sight the small size might 

 appear to be due to poor development, the study of a large series of 

 specimens from many localities shows pretty conclusively that 

 this is not the case. The size is of course subject to more or less 

 variation, as in all species of Herberta, but the measurements of 

 the leaves given in the description represent a fair average of the 

 more robust plants studied, and are only about two thirds as 

 great as the corresponding measurements in H. Hutchinsiae. The 

 difference in size is brought out with especial clearness by counting 

 the width of the basal portion in cells bet^veen the vitta and the 

 margin. In- H. Hutchinsiae such a count would give from five to 

 seven cells; in H. tenuis from three to five cells. Aside from the 

 difference in size the slightly curved or straight divisions in H. 

 tenuis and the thinner cell-walls will distinguish the species from 

 H. Hutchinsiae, where the divisions are normally strongly curved 

 and the thickening of the cell-walls much more distinctly marked. 



The basal teeth in H. tenuis, although an inconstant feature, 

 deserve a few words of comment. When they occur there may 

 be one or, rarely, two teeth on each side, and the underleaves tend 



