96 HYPNACEAE 



SCIAROMIUM Mitt. 



Distinguished from Hygroamblystegiiim chiefly by the strongly 

 bordered leaves and entire lack of paraphyllia. In habitat and 

 gross appearance it is the same, also in the cellular structure 

 of the leaves. 



S. Lescurii (Sull.) Broth. Stones in brooks, often with 

 Amblystegium ortkocladon or A. irriguum. Rare. Cold Spring!! 

 L. Id.; "On rocks in mountain rivulets, N. J. & N. Y.," Muse. 

 App. 371. Spring. 



CAMPYLIUM (Sull.) Bryhn 



Plants growing in moist places, frequently in or near water, 

 usually over earth or stones (except C. hispidulum) . The genus 

 is closely allied to Amblystegium, from which it differs in the 

 longer leaf cells and typically squarrose to squarrose-recurved 

 leaves. The leaves are rarely somewhat secund, never falcate- 

 secund or circinate. Branching usually irregular. Central 

 strand of few cells. Leaves broadly lanceolate to ovate-lance- 

 olate, usually long-acuminate and decurrent; alar cells some- 

 what differentiated, quadrate to hyaline-inflated. Costa usually 

 single, double or lacking in some species, never percurrent or 

 excurrent. Capsules inclined to horizontal, curved and usually 

 contracted under the mouth when dry and empty. Annulus 

 present; peristome perfect. 



Key 



1 — Leaves strongly squarrose 2 



Leaves not noticeably squarrose 4 



2 — Leaves strongly costate chrysophyllum 



Leaves without costa or with costa short and double 3 



3 — Plants very slender; alar cells not conspicuously enlarged or in- 

 flated hispidulum 



Plants stouter; alar cells conspicuously enlarged and inflated, .stellatum 

 4 — Stem leaves cordate-ovate, abruptly slenderly acuminate; dioicous. 



radicate 

 Stem leaves broadly lanceolate, gradually narrowed to a very long 

 slender acumination; monoicous polygamum 



Amblystegium Juratzkanum and A. Kochii may be sought in 

 Campylium, but their leaves are spreading from the base and 

 not bent, consequently they will lie flat on a slide while the 



