Hypnace^.] 68 [Hypnum. 



rostrate ; peristome of i6 lanceolate-subulate hygroscopic teeth, with 

 a hyaline border, endostome tubular at base, the processes lanceolate, 

 cleft in the middle and with 2 — 3 cilia. Inhabiting the ground, stones 

 or trunks of trees. — Der. uttvos sleep. 



The genus Hypnum originally contained all thepleurocarpous mosses, but 

 gradually many of these were separated into independent genera, leaving 

 however a host of species so closely allied that it was found impossible to 

 divide them further into genera in the ordinary acceptation of the term, hence 

 Schimper in the Bryol. europaea broke them up into groups, giving them 

 generic position, though really only subgenera or sections. For some 

 pertinent remarks on this subject see Mitten in Journ. Linn. Soc. viij, p. 13. 



The sections are — 



1. MYURIUM Schimp. H. Hochstelteri. 



2. SCLEROPODIUM Schimp. H. illecehnm. 



3. PANCKOWIA Necher. H. striatum. 



4. RHYNCHOSTEGIELLA Schimp. H. TeesdaUi. 



5. RHYNCHOSTEGIUM Schimp. H. rusciforme. 



6. RHAPHIDOSTEGIUM Schimp. H.demissum. 



7. BRACHYTHECIUM Schimp. H. mtxhulum. 



8. PLEUROPUS. Griffith. H. sericeum. 



One of these sections — Rhaphidostegium — has but slight affinity with the 

 rest, and belongs to Mitten's genus Sematophyllum of which there are above 

 100 species, and characterized by the few very large hyaline angular cells. 

 Lindberg regarded it as belonging to Leptohymeiiimn. 



Sect. I. MYURIUM Schimp. Stems creeping, turgid, julaceous, 

 irregularly branched. Leaves densely imbricated, glossy, concave, ovate- 

 acuminate, nerves two, short and faint, or obsolete, cells very narrow, vermi- 

 cular. Seta smooth ; capsule oblong, lid conico-rostellate in Berthelotianum. 



I. HYPNTJM HOCHSTETTERI Schimp. 



Dioicous ; in yellowish-brown glossy tufts. Leaves oblong, 

 acuminate into a filiform apiculus, nerveless, margin incurved and 

 sharply serrulate in the upper half. Fruit unknown. (T. XCVII, D.) 



Syn. — Hypnum Hochstetteri Schimp. in litt. Seubert F1. Azorica p. 14, No. 66 (1844). 

 " Decumbens, dense caespitosum, ramis crassiusculis julaceis, foliis dense imbricatis 

 cochleariformibus ecostatis, ex apice obtuso longe apiculatis margine minutissime 

 serratis — Colore viridi-aureo nitido insigne." 



Leucodon Lagurus Var. p. borealis WiLs. Bry. brit. 314, t. 61 (1855). Berk. Handb. 

 Br. m. 150 (1863). HoBK. Synops. 139 (1873). 



Myuriwn Hebridarum Schimp. Synops. 695 (i860), 2 ed. 807. Hobk. Synops. 2 ed. 201 

 {1884). HusN. Muse. gali. 426, t. 124 (1894). Dix. James. Stud. Handb. 390 (i8g6). 

 LiMPR. in Rabenh. kr. fl. Laubm. iii, 149 (1897). 



