400 HYPNACE/E. 



all the similar species of its own genus. It has some resemblance to Antitrichia 

 curhpendula, which is known by its toothed leaves and the absence of paraphyllia. 



B. plicatum varies somewhat in the size of its parts, but there are no important 

 varieties. 



2. Brachythecium glareosum B. & S. {Hypnum glareosum 

 Bruch) (Tab. LII. G.). 



In its most robust forms resembling Camptothecium lutescens, 

 in its more slender ones B. salebrosum ; stems creeping, often 

 very long, sometimes 6 or 8 inches, but more frequently much 

 shorter; slender, flexuose, silky, soft; branches ascending or 

 depressed, rather distant, irregularly pinnate, terete or slightly 

 flattened. In straggling patches, pale whitish green, shining. 

 Leaves somewhat crowded, i%-n4 lines long, from a wide, ovate- 

 lanceolate base, gradually or rather rapidly narrowed to an almost 

 filiform, twisted acumen, deeply plicate , slightly decurrent; margin 

 revolute just above the middle, entire at base, entire or slightly 

 denticulate in the acumen ; nerve wide at base, soon becoming 

 narrow, vanishing about the middle of the leaf. Cells elongate, 

 linear-rhomboid, thin-walled, 8-12 times as long as broad, chloro- 

 phyllose, towards base wider and rather shorter, often markedly 

 laxer, the walls thin, hardly porose ; angular cells rather numerous, 

 sub-rectangular, somewhat large and pellucid. Seta smooth. 

 Capsule small, oblique, arcuate. Lid conical, acute. Dioicous. 



Hab. Calcareous banks, quarries, etc., not uncommon. Fr. very rare, winter. 



In its typical form B. glareosum is known by its prostrate, sub-pinnate stems with 

 distant, silky, soft branches, and the leaves ending in a very long, twisted, filiform 

 acumen. Sometimes however the branches are more crowded, erect and slender, 

 when the plant resembles B. albicans. It is then known by the less concave, less 

 imbricated, chlorophyllose, denticulate leaves, with the areolation usually longer. 

 B. salebrosum differs in the monoicous inflorescence, the smaller leaves with shorter, 

 hardly twisted acumen, fainter plicse, &c. ; B. campestre in the autoicous inflorescence, 

 the leaves less acuminate, the seta slightly rough. Camptothecium and Heuropus 

 differ in the narrow basal areolation. 



3- Brachythecium albicans B. & S. {Hypnum albicans 

 Neck.) (Tab. LII. H.). 



Stems ascending, branches erect, crowded, slender, terete and 

 often julaceous, often curved at the tips ; in dense tufts, pale 

 yellowish or whitish green, more rarely bright green ; 1-3 inches 

 high. Leaves densely imbricated, when dry closely imbricated 

 with the points divergent, sometimes sub-secund, concave, plicate, 

 of thin texture, widely ovate, abruptly acuminate to a rather 

 short piliform point ; margin plane or slightly recurved at base, 



