MA I? SUP ELLA. 335 



sinus and segments acute. Perianth of much more delicate cell- 

 strncture, with distinct trigones, adnate with the lower third of 

 the innermost bracts, divided for lialf its length into 5 irregular, 

 denticulate se^'nients, terminal cells elongate, hyaline. Antheridia 

 oval, stipitate, two in each bract. Pistillidia 8, surrounding base 

 of calyptra. Capsule small, dark brown, almost spherical, walls 

 composed of two layers. 



Fruits in Summer. 



D]:\[ EN SIGNS.— Stems ^ to 1 inch long, •!() mm. x -13 mm. 

 diam., with leaves l" mm. wide; cells of stem, cortical layer 

 •02 mm. X '025 mm., interior '015 mm. ; leaves "8 mm. x '8 mm., 

 sinus -25 mm. deep, "85 mm. x "05 mm., sinus '25 mm.; cells 

 •02 mm. X 'Oo mm., -02 mm.; bracts 1-2 mm. x l"! mm., sinus 

 •4 mm.; perigonial bracts '9 mm. x "9 mm., sinus '2 mm.; inner- 

 most bracts I'P) mm. x I'lmm., sinus '5 mm., 1'5 mm. x 1*3 mm., 

 1-4 mm. x I'l mm.; perianth 1-2 mm. high, segments '4 mm.; 

 pedicel -21 mm. diam. ; capsule '5 mm.; antheridia '02 mm. x 

 •0125 mm. 



Hab. — Grows on rocks in alpine situations. 15. Loch-na- 

 gar, Aberdeenshire, /. Sj' T. Sim, August 14, 1870. Only known 

 British station. 



Found on the Continent in Norway, Sweden, Lapland, 

 Austria, and Switzerland; also in North America. 



Obs.^ — 'This is a very distinct species, altliough it has been 

 confused even by Lindberg himself with M. if.^f/data (Hilben.), who 

 has distributed both species under the name of M. f<par.s)foUn. 



It is a much larger species than M. Kstuh/ta, with which it 

 agrees only in its inflorescence; the lobes of the leaves are 

 rounder, habit much more flaccid. 



It is very similar in appearance to M. ■s/j/iacrJata (Giesccke), 

 but differs in being paroicous. 



It is not very unlike some small forms o{ J/ii///. inflafa Huds., 

 and might easily be mistaken for it ; but this species is dioicous 

 and has a perfect perianth. 



Description oi< Plate CLXIX. — Fig. 1. Plants natural size. 

 2. Stem X 24 (Norway, Norrlin, S. 0. L.). 3-5. Leaves x 31 



2 B 



