DiCRANACEiE.] 100 [Ditrichum. 



Hab. — Broken sandy ground and banks in subalpine districts ; not uncommon. 

 Fr. 9 — II. 



Dunkeld [Borrer). Rescobie and Loch Lomond (Gardiner) ! ! Inverness and Helvellyn 

 (Greville) ! Pont Aberglaslyn (Wilson) ! ! Repton rocks, Derby (Purchas 1862). Sale 

 and Alderly edge (Wilson) ! ! Dunoon (Hunt 1865). Abernethy, Perth (Howie) ! Tod- 

 morden and Hebden Valley (Hunt 1867) ! Ashdown Forest (Davies) ! Dartmoor 

 (Holmes). Cheviots (Hardy). Ireland (Moore). 



The peristome in this moss is very variable, and led the early blryologists 

 to separate it into two species, their Weissia heteremalla having the legs of the 

 teeth united ; in other forms they are more or less joined by transverse bars. 



Var. p. zonatum {Funck) Lindh. 



Stems elongated, dichotomous, sparingly branched, in very dense tufts, 

 2 — 2 in. high, pale brown and rufescent below, deep green above. Leaves 

 shorter, nearly straight, erecto-patent, appressed when dry ; seta and capsule 

 shorter. 



Syn. — Weissia zonata Funck. Brid. Bry. univ. i, 364. 

 Leptotrichum nivale C. Muell. Syn. ii, 611, 



Leptotr. Molendianum Lorentz MSS. De Not. Epil. Bri. ital. 517. 

 Leptoir. zonatum Lorentz Verb. Zool. bot. Ges. Wien. 1867, p. 683, t. 22. 

 Leptotr. tenue Var. R, glaciate Schimp. Syn. 142. 

 Leptotr. vaginans Var. ^8. glaciale Schimp. Syn. 2 ed. 140. 



Hab. — Mountain rocks. 



Above Ffynon frech, Snowdon (Wilson 1828). Glen Callater (Fergussou 1S68) ! 1 Clough- 

 na-ben (Sim i86g) ! Ben Lawers (l-Fcsi 1880) ! ! Snowdon (WwtoK 1879) ! 



Differing greatly in aspect from the typical state, but the leaves agree 

 exactly in structure, even to the apical crenulations. Always barren in 

 Britain. 



4. DITRICHUM SUBTJLATUM. {Bmch) Hamfe. 



Paroicous ; slender, short, tufted ; leaves patent or secund, ovate 

 at base, suddenly subulate, entire. Capsule oval, erect ; lid conic with 

 a short beak. (T. XIV, H.) 



Syn. — Trickostomum subulatum Bruch in Salzm. PI. Tingit. (1825). Br. Sch. Bry. eur. fasc. 

 18-20, p. 17, t. I3i{i843). WiLS. Bry. Brit. 117, t. 42 (1855). 



Didymodon aureus De Not. Spicil. 12 (1837) ! Syll. muse. u. 266 {1838). 



Leptotrichum subulatum Hampe in Linnsea 1847. C. MuELL. Syn. i, 448 (1849). Schimp. 



Synops. 145 (i860), et 2 ed. 143 (1876). Berk. Handb. Br. m. 263 (1863). De Not. 



Epil. Briol. ital. 514 (i86g). 



Paroicous; slender, in lax, bright silky, yellow-green tufts; stem 

 simple, naked at base. Leaves patent or secund, straight when dry, 

 lower small, lanceolate, upper from an ovate base, subulate; nerve 

 broad, excurrent ; cells firm, elongate quadrate. Capsule on a purple 

 seta, leptodermous, ovate, erect, golden brown ; annulus indistinct ; lid 

 convex conic, shortly rostellate ; teeth bifid, red, very slender, scabrous. 

 Antheridia in pairs with paraphyses, in the axils of the upper leaves. 



