POnELLA. 89 



X 24 (ditto). 11. Perianth x 11 (ditto). 12. Portion of mouth 

 of perianth x 04 (ditto). 13, 14. Perio'onial bracts x 24 (ditto). 

 15. Perigonial bracteole x 24 (ditto). J (5. Antheridium x 85 

 (ditto). 



5. Porella pinnata (Z) ///.), Lindh. 



Jungermania Porella, Dicks. Trans. Linn. Soc. iii. p. 2)V^ (1797), 



Jungermania distans, Schwein. Muse. Hep. Amer. p. 9, n. "> (1S21). 



Jimgermania Cordeana, Huhen. Hep. Germ. p. 291 (18P)4). 



Madotheca Porella, Nees, Nat. Eur. Leb. ?> p. 201 (I808). 



Porella pinnata (Dill.) Lindb. Hep. Hib. Acta Soc. Sc. fenn. x. p. -lOB (1875). 



Dioicous, laxly c?espitose, yellowish-brown to dark olive-green 

 in colour. Stems irref^ularly pinnate or subdichotornous, frontally 

 compressed, from 12 x 8 to 20 x 10 cells in diameter, cortical cells 

 very minute with thick walls and reddish-brown 50-80, the 

 2nd and 3rd outer layers usually tlie same, inner large, walls 

 hyaline. Leaves incubous, approximate or distant, unequally 

 bilobed, antical lobe plane or very slightly convex, ovate-oblong, 

 apices plane or indistinctly decurved, rotundate or obtuse, margin 

 entire, postical lobe or lobule minute, plane or slightly undulate, 

 a little decurrent, erecto-patent, oblong, obtuse or obtusate, 

 margin entire ; texture delicate, thin, cells smallish, 4-, 5- and 

 6-angled, walls thin, trigones absent or very minute, marginal 

 cells with slightly thicker walls. Stipules appressed to the stem, 

 ovate-rectangular, rotundate-obtuse, plane, margin entire. Flowers 

 ? on long or short lateral branches ; bracts smaller than the 

 stem leaves, unequally bilobed, somewhat carinate, antical lobe 

 oval, postical from ^ to ^ smaller ; bracteole oval, apex rotundate. 

 Perianth (young) compressed, margins decurved, convex antically, 

 broadly ovate, mouth contracted, dentate. Pistillidia 6-8. Cap- 

 sule dividing to the base into 4 valves, bistratose, the outer layer 

 3, 4 times thicker than the inner. 



DiMKNSiONS. — Stem 1 to 2 inches long, "15 mm. to '225 mm. 

 in diameter, with leaves 3' to 4" mm. wide; leaves, antical lobe 

 re mm. X r mm., 1-5 mm. x T mm., 2' mm. x 1*5 mm., 1-3 mm. 

 X '8 mm., postical 'G mm. x "2 mm., 'bb mm. x "125 mm., '7 mm. x 

 •3 mm., "8 mm. x '35 mm., "45 mm. x "2 mm., '35 mm. x -175 mm. ; 



