350 BRYACE^. [Hyimum. 



67. H. aggregatum, Mitt. Primary stems creeping; 

 branches erect, closely aggregated, simple, curved, attenuate: 

 lower leaves spreading, broadly hastate, ovate-acuminate, sub- 

 ecostate ; those on the middle of the branches broadly ovate ; 

 those near the top costate-acuminate, subjulaceous, imbricate, 

 serrulate toward the acute apex, the medial nerve prominent ; 

 perichaetial leaves ovate-lanceolate, acuminate, nerved to the 

 middle, serrate and reflexed at the apex: capsule cylindrical, 

 irregular, inclined; operculum conical, acuminate; segments 

 narrow; cilia solitary, half as long as the segments. — Journ. 

 Linn. Soc. viii. 35, t. 6. 



IIab. Vancouver Island (Lyall)', British Columbia (Douglas). 



The author compares it, on account of the julaceous imbrication of the 

 loaves, to some states of Pterogonium yracile, while other stems with less 

 imbricated leaves have a resemblance to II. myiirum, 



68. H. aplocladum, Mitt. 1. c. Stems procumbent, radic- 

 ulose, curved downward at the summit ; branches few, nearly 

 simple, often attenuate, recurved at the apex : leaves spreading, 

 cuspidate, imbricate, on the upper part of the branches ovate, 

 acute, very entire, costate to below the point ; those at the top 

 of the branches broader, more obtuse, serrulate ; alar cells round- 

 quadrate, obscure, the upper oblong; perichaetial leaves long, 

 erect, ovate-lanceolate, acuminate, nerved to above the middle, 

 serrulate at the apex : capsule suberect, oval-cylindrical ; oper- 

 culum convex, acuminate ; pedicel long, nearly smooth. 



IIab. Northwest coast of America (Douglas). 



Mitten states that it is not unlike //. acuminatum, Beauv., but that the 

 leaves are quite smooth and the habit appears to be different. The rough- 

 ness of the pedicel is so slight that it is seen only when specially sought. 



69. H. lentum, Mitt. Dioecious: leaves spreading, loosely 

 imbricate, cuspidate-imbricate at the top of the brandies, the 

 lower broader and shorter, in the middle ovate and short- 

 acuminate, those of the branchlets ovate-lanceolate or at the 

 apex broader and more obtuse, narrowly serrulate, costate to 

 above the middle ; cells at the basal angles broader, mixed with 

 narrow ones, and with thickish walls, the upper narrow ; peri- 

 chaetial leaves ecostate, clasping at base, serrulate, recurved, 

 entii-e at the apex: capsule oval-cylindrical, suberect, irregular; 

 pedicel rough ; segments solid, with single cilia equalling them 

 in length ; membrane produced to one-third the length of the 

 teeth. — Journ. Linn. Soc. viii. 36. 



