LEUCOBRYACE^.] 86 [Leucobryum. 



terminal or lateral by innovation ; peristome of 16 teeth, bifid and tra- 

 beculate as in Dicranum. Leaves composed of 2 or more strata of large 

 empty rectangular parenchymatous cells, having their internal walls 

 perforated by large circular foramina, and a central series of narrow 

 quadrangular chlorophyllose cells. Terrestrial, on heaths and in woods. 

 Deriv. Acv/cos white, (3pvov a moss. 



LEUCOBRYUM GLA.UCUM (L.) Schimp. 



Dioicous ; densely compacted, whitish, glaucous. Leaves crowded, 

 erecto-patent, entire, broadly lanceolate, cuspidate, with incurved 

 margins; perichastial convolute, acuminate. Capsule oval, cernuous, 

 strumose, sulcate, lid with a long oblique subulate beak. (T. XIII.) 



SYN. Muscus trichoides montanus albidus fragilis DOODY. RAY Synops. stirp. brit. 2 ed. app. 



339 (1696). MORIS. Hist. oxon. iii, 630, S. xv, t. 6. fig. 22 (1699). 

 Bryum trichoides, erectis capitulis, albidum fragile DILL. Cat. Giss. 225 (1719) ; et in RAY 



Synops. 3 ed. 97, n. 29 (1724). 

 Bryum albidum et glaucum fragile majus,foliis erectis, setis brevibus DILL. Hist. muse. 362, 



T. 46, fig. 20 (1741) ; et herb. 

 Bryum glaucum L. Sp. pi. ii, iri8 (1753) ; Syst. Nat. ii, 701. HUDS. Fl. angl. 407 (1762). 



NECK. Meth. muse. 226 (1771). WITH. Bot. arr. Br. Veg. ii, 673 (1776). LIGHTF. Fl. 



Scot, ii, 723 (1777). Fl. Dan. t. 824, fig. 3 (1780). HOFFM. Deutsch. Fl. ii, 38 (1796). 



ABBOT Fl. Bedf. 239 (1798). HULL Brit. Fl. P. 2, 263 (1799). 

 Hypnum glaucum WEISS Cr. gott. 208 (1770). WEB. Fl. gott. 75 (1778). 

 Fuscina glauca SCHRANK Bayers. Fl. ii, 457 (1789). 

 Mnium glaucumWiru. Bot. arr. Br. Veg. 3 ed. iii, 801 (1796). 

 Dicranum glaucum HEDW. Fund. muse, ii, 92 (1782) ; Sp. muse. 135 (1801). ROTH Tent. 



Fl. germ, i, 461 (1788), et iii, 161. SIBTH. Fl. oxon. 281 (1794). SWARTZ Disp. muse. 



suec. 35 (1798). BRID. Muse. rec. ii, P. I, 165 (1798) ; Sp. muse. I, 205 (1806) ; Mant. 



muse. 66 (1819) ; Bry. univ. i, 407 (1826). ROEHL. Moosg. Deutsch. 351 (1800) ; Deutsch. 



Fl. iii, 75 (1813). SMITH Fl. brit. iii, 1216 (1804) ; Eng. Bot. t. 2166. TURN. Muse. hib. 



73 (1804). P. BEAUV. Prodr. 54 (1805). SCHULTZ Fl. starg. 299 (1806). WEB. MOHR 



Bot. Tasch. 66 (1807). VOIT Muse, herbip. 38 (1812). SCHWAEG. Suppl. I, P. I, 187, t. 



48 (1811). MART. Fl. cr. Erl. 105 (1817). HOOK. TAYL. Muse. Br. 52, t. 21 (1818). 



GRAY Nat. arr. Br. PI. i, 734 (1821). HOOK. Fl. Scot. P. 2, 131 (1821) ; Brit. Fl. ii, 37 



(1833). FUNCK Moost. 30, t. 21 (1821). ZENK. DIETR. Muse. Thuring. n. 40 (1822). 



HUEBEN. Muse. germ. 234 (1833). BALS. DE NOT. Prod. Bry. Mediol. 133 (1834). 



MACKAY Fl. hib. P. 2, 22 (1836). DE NOT. Syll. muse. n. 276 (1838). 

 Leucobryum vulgare HAMPE in Reg. bot. zeit. 1837, P- 282, et in Linnaea 1839, p. 42. 



C. MUELL. in Linn. 1843, p. 687; Syn. muse, i, 74 (1849). RABENH. Deutsch. Kr. Fl. ii, 



P. 3, 120 (1846). 



Oncophorus glaucus BR. SCHIMP. Bry. eur. fasc. 41, mon. t. 1-2 (1849). 



Leucobryum glaucum SCHIMP. Coroll. Br. eur. 19 (1855). Synops. 101, et 2 ed. 109. WILS. 

 Bry. Brit. 82, t. 16 (1855). JENS. Bry. Dan. t. II, f. 10 (1856). BERK. Handb. Br. m. 

 276, t. 23, f. 6 (1863). MILDE Bry. Siles. 79 (1869). DE NOT. Epil. Briol. ital. 285 

 (1869). HOBK. Syn. Br. m. 49 (1873). HUSN. Mouss. nord-ouest 60 (1873). 



Dioicous; in very dense cushioned tufts, pale glaucous green 

 above, pale dirty brown below. Stems 1-6 in. high, dichotomous, fas- 

 tigiate, not radiculose. Leaves in 13 rows, soft, patent, rarely sub- 

 secund, entire, from an oval-oblong base, lanceolate, tubulose from the 

 incurved margins ; lower half with a very narrow lamina of slender 

 prosenchymatous cells. Perichastial bracts sheathing, lanceolate-subu- 

 late ; seta elongated, rufous, twisted to the right when dry. Calyptra 



