HypnacEjE.] 51 [Amhlystegium. 



Syn. — Hypnum fluitans 8. amphibium c. paludosum Sanio Beschreib. Harpidien 14. 



Hab.— Abbots moss, Cheshire {Holt 1887) ! ! 



Var. £. Arnellii Sanio. 



Floating, laxly tufted, glossy, yellow-green above, fuscous below, pinnate 

 with short divergent branches ; leaves falcate, oblong-lanceolate, with very 

 long attenuated points, serrulate, basal cells rectangular, hyaline, incrassate, 

 upper narrow, much elongated. 



Syn. — Hypnum fluitans Z. amphibium h. Arnellii pallens Sanio. 



Hab.— Strensall Common, York {Holt 1886) ! ! 



A closely^allied form — pseudoalpinum Sanio — with long nearly simple 

 dense-leaved stems, fuscous-black for the greater part of their length, is found 

 by Mr. Holt on Abbots moss. 



Var. ^. falcatum ScUmp. 



In yellowish tufts, ferruginous at base, simple or with few branches ; 

 leaves dense dimorphous, falcato-recurved, lower lanceolate, upper oblong- 

 lanceolate, with a subulate acumen, involute below. 



Syn. — Hypnum fluitans Wax. falcatum 'Sty. sva. BouL. Muse. Fr. 63. Ren. in HusN. Muse, 

 gall. 383. 



Hab. — Abbots moss {Holt 1887) ! ! the form alpinum of Sanio. 

 Var. -q. Holtii Sanio. 



Stems elongated, floating, yellowish-green at apex, rufescent below, not 

 glossy, pinnate with numerous very short erect branches. Leaves erecto- 

 patent, lanceolate, slightly auricled, extended into a very long, flexuose 

 subulate acumen, cells laxer, all margin remotely denticulate. 



Syn. — H. fluitans anglicum homophyllum Holtii Sanio. 



Hab. — Abbots moss, Cheshire {Holt 1887) ! ! 



This variety both in habit and leaf-form is quite striking, and I am 

 pleased to associate it with one who has done so much to supply me with 

 forms of this most difficult group, which may easily be doubled if we carry 

 out the subdivision according to Sanio's arrangement, which cannot be 

 properly studied without type-specimens of the various forms. 



30. AMBLYSTEGIUM KNEIFFII Schimp. 



Dioicous ; stem erect, irregularly branched or pinnate. Leaves 

 distant subsecund, falcate, ovato-lanceolate, acuminate, entire, nerve § 

 the length ; cells dilated at basal angles ; perich. bracts elongated, 

 sulcate. Capsule subcylindric, curved, cernuous. (T. XCIV, D.) 



Syn. — Muscus palustris valde ramosus surculis erectioribus, foliolis in tenues et longos mucrones 

 productis Ray Synops. 2 ed. 39, n. 14 (1696). 



