mdsci. (mosses.) 635 



33. MACKOilIITKIUM, Brid. (Tab. 16.) 



Calyptra large, conic-mitriform, longitudinally plicate or sulcate, more or less 

 laeiniate at the base, hairy or glabrous. Operculum subulate-rostrate from a 

 conic base. Capsule erect-ovate, oval or oblong, long-pedicellate. Peristome 

 double or single, sometimes wanting; the exterior 16 teeth lanceolate, usually 

 in pairs ; the interior a more or less exserted membrane, truncate or cut to the 

 base into 16 or more cilia. — Stems creeping; branches erect, crowded, fertile 

 at their summit; leaves lanceolate-oblong, continuously costate, with a dense 

 and minute dot-like areolation above, enlarged rectangular and pellucid below. 

 (Name from fj.a<p6s, long, and fjurplov, a veil, referring to the very large calyptra.) 



1. M. Oa'tigei, Hochstetter? Stems slender, 1'- 2' long, creeping, sub- 

 pinnately branched ; branches short, erect; leaves crowded, erect-patent, ovate- 

 lanceolate, papillose, recurved on the margins, ventricose-eoncave at base, cana- 

 liculate above ; capsule oval-oblong ; peristome single (the exterior wanting), a 

 short truncate membrane; calyptra hairy. — Top of Jonah Mountain, Georgia, 

 Lesquereux ; on the bark of old pine-trees. — We have seen Cape of Good Hope 

 specimens apparently identical with ours, referred doubtfully to M. tcnue and 

 M. Dregei. (Tab. 16.) 



34. SCHLOTHEIMIA, Brid. (Tab. 16.) 



Calyptra large, conic-mitriform, scabrous at the apex, with 4 or more inflexed 

 lobes or appendages at the base. Operculum conic-subulate. Capsule subcy- 

 lindrical, erect, pedicellate. Peristome double; the exterior 16 teeth in pairs, 

 linear-lanceolate (when dry revolute) ; the interior 16 or more irregular cilia. — 

 Mode of growth, habit, and structure of leaves very much as in the last genus : 

 both genera being the tropical analogues of Orthotrichum, and remarkable for 

 the ferruginous or reddish-brown color usually predominant in their foliage. — 

 (Named for Count Schlotheim.) 



1. S. Sullivailtii, C. Mull. Monoecious; branches short;' leaves very 

 crowded, ovate-oblong, obtuse, apiculate, rugose-undulate above, the costa ceas- 

 ing below the point. — Grows in compact, rigid, dark-brown mats, on trees.— 

 Lower portion of the Southern States. (Tab. 16.) 



Tribe XIV. PTY CHOMITRIEiE. 



35. PTYCHOHIITRIUM, Br. & Sell. (Tab 16.) 



Calyptra campanulate, plicate, deeply laeiniate at the base. Operculum conic- 

 subulate. Capsule oval, erect, annulate, pedicellate. Peristome single: teeth 

 16, perforated or fissile into two unequal filiform segments. Inflorescence mo- 

 noecious. — Perennial plants, growing on rocks and trees : in habit and aspect 

 intermediate between Orthotrichum and Grimmia. — (Name from 7rru£, TrrLx°v, 

 a fold, and jXLrpiov, a veil, referring to the plicate calyptra.) 



1. P. incurvinn, Schwsegr. Stems 2" -3" high, aggregated; leaves 

 crowded, oblong, ligulate, spreading, slightly incun ed at the obtuse and some- 

 what cucullste apex, concave, costate nearly to the point, of a rather thick tex- 



