HYPNACE^E.] 17 [Amblystegium. 



common habit or character, but yet not sufficiently important to supply a 

 foundation for genera. 



The sections of the genus are 



1. EU AMBLYSTEGIUM Lindb. chiefly represented by the small 



species of which A. seypens may be taken as the type. 



2. CAMPYLIADELPHUS Lindb. principally grouped round 



A. stellatum and resembling Campylium Halleri in habit. 



3. DREPANOCLADUS C. Muell. The difficult group afterwards 



named by Sullivant Harpidium, to which Hypnum aduncum and a 

 number of species with falcato-secund leaves belong. 



4. SCORPIDIUM Schimp. H. scorpioides. 



5. HYGROHYPNUM Lindb. Superseding Limnobium SCHIMP., a name 



already in use for a genus of flowering plants of the family 

 Hydrocharidaceae. H. palustre is the type of this group. 



6. CALLIERGON Sulliv. Represented by H. cordifolium and 



stramineum. 



Sect. i. EU AMBLYSTEGIUM Lindb. Stems creeping, much and 

 irregularly branched. Leaves erecto-patent, ova to-lanceolate, cells ovoid or 

 elongato-rhomboidal. Capsule oblong or cylindric, curved. 



CLAVIS TO THE SPECIES. 



Plants very small and slender, leaves nerveless. 



Dioicous, capsule suberect. Sprucei. 



Autoicous, capsule horizontal. confervoides. 



Plants larger, leaves nerved. 



Nerve excurrent. fallax. 



reaching apex. 



Stem densely coated with radicles and paraphyllia. fiUcinum. 



Stem without radicles and paraphyllia. 



Leaves auricled, acuminate. irriguum. 



not auricled, somewhat obtuse. fluviatile. 



vanishing just below apex. 



Leaves broadly ovate, with a short acumen. curvicaule. 

 oval-lanceolate, gradually acuminate. variuni. 



reaching middle of leaf. 

 Plants slender, leaf-cells short. 



Leaves patent, ovate, longly acuminate. radicale. 



, deltoid-ovate, longly acuminate, with larger cells. Jurat zkce. 



ascending, shortly acuminate. serpens. 



robust, leaf-cells longer. 



Leaves broadly oval, cells 5 8 times long as broad. trichopodium. 

 oblong-lane., cells 12 15- . riparium. 



i. AMBLYSTEGIUM FILICINUM (L.) De Not. 



Dioicous ; stem pinnate, 2 4 in. high, radiculose. Leaves ovato- 

 lanceolate, falcato-secund, serrulate, nerved to apex. Caps, oblong, 

 cernuous, lid conical. (T. LXXXVII, D.) 



