56 THE SPHAGNACEA OR PEAT-MOSSES OF 
This is the compact form of the species, and is always of small 
size and dingy hue. It strangely got mixed in my Exsiccata with 
Sph. acutifolium var. arctum, from which it may be readily dis- 
tinguished by the structure of the stem leaves. 
10. Sphagnum rigidum (N. v. Esens.), Scupr. 
Pu. XIII. 
Monoicous ; in dense whitish tufts, tinged with glaucous green 
or rufous. Stem with 2-3 strata of cuticular cells. Stem leaves 
very small, broadly ovate, the apex rounded, erose. Leaves of 
divergent branches, ovate-oblong, very concave; the margin in- 
flexed; the apex truncate and toothed; hyaline cells reticulose 
fibred, the chlorophyllose central, compressed. 
Synon.— S¢h. compactum B. rigidum, NrxEs, Hscu. St. Bryol. Germ. i. p. 14, 
t. 2, f. 5* (1823). Brip. Bryol. Univ. i. p. 17 (1826). C. Mbxx. Synops. i. p. 99 
(1849 . 
Sph. immersum, NEES, Uscu. St. Bry. Germ. i. p. 11, t. 2, f. 4. Bru. Bry. 
Univ. i. p. 9. 
Sph, ambiguum, H0BEN. Musc. Germ. p. 25 (1833). 
Sph. rigidum, Scuimp. Torfm. p. 65, t. 18 (1858); Synops. p. 678 (1860), et 
ed. 2, p. 839 (1876). Linps. in Ofv. K. Vet. Ak. Forh. xix. p. 139, n. 8 (1862). 
Russow, Torfm. p. 77 (1865). MuILpz, Bryol. Siles. p. 390 (1869). Harrm. 
Skand. Fl. ScHiiepH. in Verh. Z. B. Gesel. Wien, 1865, p. 401. Kuincc. in 
Schr. der K. Phys. ek. Gesel. zu Konigs. 1872, p. 9. BraiTHw. Sphag. Brit. Exs. 
n. 23 (1877). 
Monoicous ; in dense, rather rigid tufts, glaucous green above, 
whitish below. Stems erect, dark brown or blackish, 4-10 in. high, 
densely ramulose, usually 2, sometimes 3-4 partite; cuticular 
cells small, non-porose, in 2-3 strata; cells of the peripheral 
layers dark reddish brown. Stem leaves minute, erect, inserted 
obliquely, from a broad base, ovate, or obtusely triangular, with a 
rounded erose apex, minutely auricled ; areolation lax and rhom- 
boidal in the middle, with a broad border of thin narrow cells, 
all without fibres or pores, or with the apical cells fibrose and 
porose, and a few fibres in the basal cells. 
Ramuli 3-4 in a fascicle, short, 1-2 erecto-patent, obtuse, the 
others flagelliform, slender, lax-leaved; cuticular cells larger, the 
porose scarcely distinct from the rest. Leaves of the divergent 
branches quinquefarious, from an ascending base, erecto-patent, 
rigid when dry, ovate-oblong, very concave, somewhat cucullate 
at apex, but when flattened out, more or less truncate and obtusely 
