115. C. BREVIFOLIUS. Schpr. St. ½in. yellowish green, with caducous ramuli. L. short rigid erect lanceolate, longly acuminate, concave, obsoletely toothed at apex. Nerve half base; basal areolæ hyaline lax rectangular, gradually shorter and more quadrate, lower ones with their transverse walls much thickened. Dry and stony places. Scotland. 21. POTTIA. EHRH. 116. P. PUSILLA. Hedw. (_P. cavifolia._ Ehr.) St. very short and simple or branched; l. erecto-patent concave, obovate or elliptical; caps. oval, on a short seta; lid obliquely rostrate. Banks and mud walls. III. var. β. stem short, l. somewhat acuminate, scarcely piliferous. γ. _incana._ N. & H. l. with long hair-like points. 117. P. MINUTULA. B. & S. Very minute, l. carinate, spreading, ovate-lanceolate, with recurved margins; caps. small, ovate-truncate; lid flattish conical, not beaked. Fallow fields. Winter and Spring. var. β. _rufescens._ l. narrower reddish. γ. _conica._ l. ovate-lanceolate, with a short mucro, caps. narrower at mouth. 118. P. TRUNCATULA. L. St. ⅛in., l. spreading obovate-acuminate or oblong-lanceolate, with a slightly excurrent nerve; caps. obovate, truncate, with a wide mouth; lid convex obliquely rostrate. Fallow soil. II. III. var. β. _major._ caps. oval-oblong, stem smaller. γ. _sub-cylindrica._ l. ovate-lanceolate; nerve much excurrent; caps. sub-cylindrical. 119. P. CRINITA. Wils. St. ¼in. tufted; l. obovate-oblong obtuse; nerve excurrent into a very long hair-like point; caps. elliptic-oblong, scarcely contracted, calyp. smooth. Rocky and moist places. 120. P. WILSONI. B. & S. St. ¼in. in tufts, l. ovate-oblong, obtuse; nerve excurrent into a longish mucro; caps. elliptic-oblong, contracted at mouth; lid shortly and obliquely rostrate; calyp. rough at apex. Sandy banks. II. 121. P. LITTORALIS. Mitt. (Jour. Bot. IX., 4.) L. oblong-spathulate obtuse or acute, lower pale, upper green, nerve excurrent, longer in lower leaves; areolæ in upper part of leaf small obscure, smooth, lower oblong pellucid; caps. oblong-oval, mouth less than greatest diameter; lid rostrate slightly twisted; male fl. bud-like. Aldington, near Brighton, Hastings. 122. P. ASPERULA. Mitt. (l. c.) L. obovate-spathulate, acute, but not acuminate, nerve excurrent into a short point; areolæ upper rounded rather obscure, each with several elevated points, lower oblong smooth pellucid; caps. oval, lid rostrate slightly twisted; antheridia naked in axils of comal leaves. Henfield, Sussex; Penzance (Curnow), Jersey (Piquet).