16. S. CUSPIDATUM. Dill. Ehr. St. 3–12in., flaccid with distant deflexed attenuated branches, the younger ones cuspidate; st. l. ovate acute, br. l. lanceolate acute præmorse slightly fringed and bordered; per. l. broadly ovate, acute, ped. short: dioicous. Wet bogs. VI. VII. 17. S. RECURVUM. P. Beauv. “Distinguished from the last by its branch leaves, recurved when dry, elliptical, not attenuated towards the apex; usually growing out of the water, whilst _S. cuspidatum_ is almost submerged.”—G. E. Hunt. Common in bogs. var. δ. _laricinum_. Spruce. l. loosely imbricated, slightly undulate when dry, areolæ very minute. 18. S. CONTORTUM. Schultz. St. 3–6in. rigid blackish, “with a single layer of cortical cellules”, and with crowded generally contorted attenuated branches; leaves ovate-lanceolate, acute concave, frequently 3–toothed at the apex, the cellules bordered with a row of small pores at the back of the leaf: dioicous. Bogs and ditches. VII. var. γ. _obesum_; stem more robust, branches thicker and longer, leaves larger. 19. S. SUBSECUNDUM. Nees & H. Allied to _contortum_, but more lax in habit, stems more slender, with shorter branches and with the branch leaves generally more or less secund. 20. S. CURVIFOLIUM. Wils. MS. Allied to the last; stem with a cortical layer of two or three rows of cellules, leaves without marginal pores, entire, acute. _b._ Leaves squarrose. 21. S. SQUARROSUM. Pers. St. 4–12in. rigid, often forked, with long deflexed attenuated branches; l. ovate-acuminate acute, recurved; caps. large on a longish pedicel. Bogs. VI. VII. 3. ARCHIDIUM. BRIDEL. 22. A. PHASCOIDES Brid. St. ¼in., second year branched sometimes 1in.; fertile branches short, barren ones longer, slender, and with more distant leaves; l. lanceolate pointed, upper ones longest, entire, nerved nearly to or beyond apex; p.l. ovate-lanceolate, toothed near the apex, nerve excurrent. Moist clayey or chalky banks, &c. III. IV. 4. PHASCUM. LINN. SECT. I. (EPHEMERUM.) Almost stemless, capsule immersed, barren fl. gemmiform at base of, or near to, fertile fl. _a._ Growing from a conferva-like thallus, columella fugacious. 23. P. SERRATUM. Schreb. “Stemless, leaves lanceolate, nerveless (?) serrated, connivent; capsule large roundish ovate, sub-sessile.” (Wils.) Sandy banks or fallows. Spring or Autumn. var. β. _angustifolium._ “Leaves narrower, linear-lanceolate, obscurely toothed; caps. smaller.” 24. P. COHÆRENS. Hed. Stemless, very minute; l. ovate-lanceolate, keeled, erect, nerved to apex, and serrated about half way from summit; capsule immersed sub-sessile. On the ground. Winter. 25. P. TENERUM. Bruch. Inconspicuous; l. broad ovate-lanceolate, slightly denticulate at apex, very flaccid; caps. small, pale yellow, calyptra conical. Bry. Europ. vol. I. On the mud of dried-up pools. Winter.