228 ox RADULA GERMANA, JACK. 



Craig Calleacli (^ ), July, 1881, T. Rogers. This species appears 

 to be with us, so far as I know, restricted to the Scotch Alps. I 

 liave seen nothing of it on several of the Welsh Mountains, and 

 whilst botanising with Mr. Geo. Stabler on Bow Fell, June, 1881, 

 saw no trace of it there. Herr Jack records it from Germany, 

 Switzerland, and Austria. 



Resembling large forms of Lejeunia serpijUifoUa, growing in 

 patches procumbently with shoots imbricating, or growing erect 

 when intertwined with mosses [Dicranumfalcatum, &c.); also of a 

 bright pea or pale yellowish green, young terminal branches 

 darker green ; the lower parts and older stems of a pale sordid 

 brown colour, stems f of an inch to an inch long, frontally com- 

 pressed, showing upon a transverse section 6 cells by 9 ; those of 

 the female plant subpinnate, subbipinnate, furcate, or dichotomous; 

 barren male stems often almost simple, with a few very short 

 branches, which are longer near the apex ; the barren and fertile 

 male stems are narrow, graceful, and flexuose ; the fertile male 

 irregularly pinnate, having several lateral amentula consisting of 

 from 8 to 15 pairs of perigonial leaves, the chief stem often 

 terminating in a spike of perigonial leaves ; ramuli fi^equent, very 

 short, arising from the side of the stem alternately, bearing usually 

 3 to 4 pairs of leaves, length about 1 mm., breadth with leaves, 

 •2, '3, -4 mm. Eootlets few, arising from the under side of the 

 lobule, which is there drawn out to a pimple in bunches of short 

 sordid white threads. Leaves alternate, ascending, the upper ones 

 imbricating one another, those of the lower portion of the stem 

 approximate ; on slender stems the leaves are more distant, not 

 imbricating, roundish ovate or obovate, convex seen from above, 

 and hiding the stem ; entire, the terminal leaves (superior lobes) 

 often irregularly erose from the formation of gemmse ; lobule 

 usually about one-third less the size of the superior lobe, oc- 

 casionally half, rhomboid, subquadrate or quadrate, ovate at the 

 free corner, acute or obtusate, base tumid, with the upper portion 

 plane and appressed to under side of superior lobe, some lobules 

 slightly repand; the basal pouch often contains foreign bodies 

 [Rotifera, &c.)' wnich may easily be mistaken for old or imperfect 

 antheridia. Involucral leaves accrescent, oblong, with narrower 

 lobes and lobules ; also the barren involucral leaves have obtuse 

 inflexed lobes, which give the abortive involucre a turbinate 

 shape ; they enclose from 7 to 10 sterile archegonia ; perigonial 

 leaves closely imbricating each other, smaller, ovate, ventri- 

 cose, with lobule ovate, almost equal in size to superior lobe, 

 forming a deep pouch ; cells small, hexagonal, usually thickly 

 tilled with chlorophyll granules ; trigones very minute ; colesule 

 compressed, obconical, with a gradually tapering base ; mouth 

 entire. 



" Calyptra with a long neck, slender, pyriform ; pedicel pro- 

 jecting 1-2 mm. above the colesule; capsule oblong-oval, divided 

 to the base into 4 oval valves ; elaters curved, bispinal, loosely 

 winding ; spores almost round, finely granulate." — Jack. 



Antheridia oval, enclosed in the deep pouch-like perigonial 



