170 On Bog Mosses. 



17. Sphagnum Wulfii Girgensohn. 



Archiv fiir Naturkunde Liv— , Est— und Kurlande, Ser. 2, Band II., 

 p. 173 (18G0). 



Plate LXXVII. 



Syn. — Sph. Wnlfianum Gikgensohn 1. c— Bot. Zeit. 1862, p. 247. — Eussow 

 Torfm. p. 66 (18G4).— Milde Bryol. Siles. p. 385 (1869). „ 



Austin Muse. Appalach. No. 32 (1870). Sph. pycnocladum Angstrom Mss. 

 Rabenh. Bryoth. Eur. fasc. XV, No. 709. 



Monoicous. Plants robust, 5-10 in. high, yellowish or brownish 

 green or sometimes deep green, in loosely cohering tufts. Stem 

 simjjle, or sometimes divided, hlachish hrown, straight, solid, densely 

 ramulose, iviih two cortical strata of small non-porose cells, the 

 woody zone 'purple, of 5-6 rows of strongly thickened cells. 

 Ranndi 7-12 in each fascicle, of which 3-5 are divergent, short, 

 slightly arched, heeoming clavate upward and then suddenly 

 pointed ; the rest deflexed and closely appressed to stem, very long 

 and slender, lax-leaved, usually of a pale rose colour ; the porose 

 cortical cells short and scarcely differing from the rest. Branches 

 of the coma short, thick, numerous, forming a large dense 

 capitidum. 



Cauline leaves very small, from a broad base Ungulate- 

 triangular^ reflexed ; the hyaline cells repeatedly divided, without 

 fibres or pores, those in the middle rhomboidal, becoming narrower 

 towards the margin, where they form a border of 3-6 rows. 



BamuUne leaves imhricated, erecto-patent, recurved in their 

 upper half or suhsquarrose, all ivith a border of two roivs of very 

 oiarroiv cells ; the basal minute ovato-lanceolate, the median ovate, 

 elongato-lanceolate, ivith the margin involute and shortly 3-4 

 toothed at apex, the uppermost narrowly lanceolate, scarcely 

 toothed. Hyahne cells with annular fibres, upper with numerous 

 small pores on each side of cell, lower lateral with large pores which 

 become fewer in those at the middle of leaf. Chlorophyll cells 

 compressed, enclosed by the hyaline in the upper part of leaf, but 

 in the lower part free both on the inner and outer su/rface, and 

 rectangular in section. 



Male inflorescence purple, at the apex of the divergent branches. 



Fruits clustered in the capitulum, but moderately exserted ; 

 perichaetium straw-coloui'ed or pink, lower bracts ovate acuminate, 

 concave, recurved at apex, upper elongate oblong, slightly emargi- 

 nate and somewhat recurved at point, convolute, without fibres or 

 pores. Capsule small globose, blackish brown, spores pale yellow. 



Var. /3. squarrosidum Russow. 



Leaves of the longer divergent branches squarrose, with more 

 numerous pores. 



Hab. — Wet pine-woods, rare. Techelfer woods near Dorpat, 

 fi-equent (Girgensohn 1847) ; Kaddak near Eeval, AUentacken 



