Analytic Keys to the Species of Mosses. 
79 
It). Seta smooth. 
i. Leaves transversely rugose and longitudinally plicate. 
Plants slender H. adimcum yar. gracilescens, 133. 
Plants very stout. 
Leaves serrate at apex, alar cells quadrate . . H. rugosum, 144. 
Leaves subserrate at apex, alar cells scarcely different, 
H. rolnistimi, 145.. 
ii. Leaves not rugose , often plicate. 
Alar cells much enlarged or differently colored. 
Paraphyllia abundant {rarely feiv). 
Leaves plicate.H. commutatum, 143. 
Leaves not plicate.H. filicinum, 142. 
-i —*— Paraphyllia 0. 
Annulus 0. 
Autoicous, leaves quite entire.H. palustre, 165. 
Autoicous, leaves denticulate.H. fluitans, 136. 
Dioicous, leaves entire above, serrulate below H. exannulatum, 137. 
Annulus large. 
Autoicous, leaves plicate, teeth orange at base, yellowish 
above.H. uncinatum, 1 135. 
Dioicous, leaves sulcate, teeth orange with a broad hya¬ 
line border.H. ochraceum, 172.. 
Dioicous, leaves striate, teeth brown or dark orange, not 
bordered. 
Alar cells pellucid.H. adimcmn, 133. 
Alar cells orange .H. Sendtneri, 134. 
* * Alar cells small or scarcely different. 
Leaves serrate.H. Thedenii, 41. 
Leaves quite entire. 
& 
Plants very large and stout (15—20 cm.), leaves costate to 
near apex. 
Regularly pinnate H. adimcum yar. liamatum, 133. 
Irregularly and dichotomously branched . H. lycopodioides,' 140. 
Plants much smaller, leaves obscurely bicostate . H. Watsoni, 141. 
Plants much smaller, leaves costate to above middle. 
Autoicous, purplish-red, red-brown or nearly black H. revolvens, 138. 
Dioicous, dirty green or yellow H. vermcosum, 139. 
1 Hyp. symmetricum Ren. et Card. QBot. Gaz. xiv (1889), 99, pi. xv), is a sub-species of 
H. uncinatum, from which it is distinguished by the “ narrower, erect and quite symmetric 
capsules, sometimes clustered by two in same perichsetium.” 
