Obs.—This rare species, discovered on Bow Fell by Mr. George
Stabler, is distinguished from any of the Cesiæ by the presence of
a true perianth, from Marsupella usfulata [Iliibeti.) by its closer
appressed leaves, which are more oval, with .shallower sinus and
more obtuse segments. For further interesting notes see Dr.
Spruce’s excellent paper in Revue Bryoloyique for 1881.
D escription of P late CLXVÍL—Fig. 1. Plants natural
size. 2. Portion of fertile stem x 04 (Bow Fell, G. Stabler).
3, 4. Leaves x 85 (Snowdon, W. H. P). 5, 6. Ditto x 64
(Bow Fell, G. Stabler). 7. Upper leaf x 85 (ditto). 8. Portion
of leaf near middle x 290 (ditto). 9. Ditto, near the base
(ditto), 10. Sub-braot x 85 (ditto). 11, 12. Perigonial bracts
X 85 (ditto). 13. Bract and portion of perianth x 85 (ditto).
14. Portion of perianth x 85 (Snowdon, W. H. P).
5. M a r s u p e lla u s t u l a t a {iiiiben.), Sjmice.
Jungermania ustulata, HUbener. Hep. Germ. p. 132 (1834).
Uarsupdla ustulata. Spruce in “ Eev. Bryol.” p. 100 (1881).
Marsupella ustulata (Hüben.), Spruce in litt.
Paroicous, shallowly cæspitose, minute, reddish or purplish
brown, in shady places green, in exposed alpine situations
purplish black in colour. Ehizomes creeping ; radiculose, rootlets
frequent, intricately flexuose, stoloniferous. Stems suberect
or erect, simple or slightly branched; fertile clavate, leaves
accrescent, subimbricate or imbrioate, sterile small, equal, dislant
or approximate, patent or erecto-patent, broadly oval, ovate or subrotund,
sometimes subovate, laxly complicate, carinate, from I to 4
bilobed, sinus acnte, rarely obtuse, lobes acute, rarely obtuse ; texture
firm, cells very small to small, roundish-quadrate, walls firm,
angles slightly thickened, sometimes slightly trigonous, basal cells a
little larger and elongate. Inflorescence terminal. Bracts ? 2-5
pairs, almost twice as large as the lower or sterile stem leaves,
broadly ovate, orhiculate, perigonial bracts subcordate, ventricose
and antheriferous at the base, ^ to I bilobed, lobes acute or obtuse,
innermost longer and erect, margin reflexed or undulate, more or
less connate at the base, lobes often obtuse, rarely acute. Antheridia
1 or 2 in the axil of the bracts, oval. Perianth small,
immersed, delicate, composed of larger cells than the leaves,
oval-globose or tubular. 4, 5 laciniate, sometimes composed of
2 bilobed leaves rarely with a further segment, adnate from the
base to nearly the middle with the innermost bracts, very rarely
free to the base. Calyptra oval-globose, surrounded about the base
by 6-8 sterile pistillidia. Capsule globose, composed of two layers,
inner with semi-annular fibres. Spores small, brown. Elaters
as wide as the spores, same colour, bispiral, rarely trispiral.
D imensions.—Stems 2- to 5' mm. long, '075 to T5 mm. diam.,
with leaves (fertile) '65 mm. wide (sterile) -35 mm ; leaves '3 mm.’
X -25 ram., seg. -11 mm., -6min. x -5 mm., seg. -15 mm., -5 mm.
X Tm-n., seg.-lmm., •25 mm. x '25 mm.,-35 mm. x •3 mm., •4mm.
X -33 mm., -55 mm. x -45 mm. ; cells -02 mm. x -0125 mm., -015
mm. X -015 mm., -0175 mm. x -0175 mm., -02 mm. x -015 mm. ;
sub-braet '4 mm. x4'75 ram.; seg. •! mm; bracts 1' mm. x l '
mm. ; seg. '225 mm., '5 mm. x '5 mm., '65 mm. x '5 mra., '85 mm.
X 1-1 mm., 1-1 mm. x I 'l mm.; perianth '75 mm. high; pedicel
2 mm. long; capsule '3 mm.; spores '01 mm. diam.; elaters
•1 mm. long x '01 mm. broad.
H ab .—Grows in very thin shallow patches on soft sandstone
rooks in moist situations, in the plains or in subalpine or alpine
localities. Eare.
2. Blaokdown, Sussex, Jenner, George E. Bavies. 7. Fairy
Glen, Bettwys-y-Coed, Br. Carringlori ; Snowdon, Carnarvonshire,
W. II. P. ; Tyn-y-Groes, Dr. Carrington é W. II. P. ; Cader
Idris, Merionethshire, Wild & Holt. 10. Park Quarry, Castle
Howard. Yorks., Dr. Spruce, M. B. Slater, G. Stabler. 12.’ Harter
Fell; Bow Fell; Oxenden,Westmorland, G. Stabler. 16. Moidart,
West Inverness, S. M. Macvicar d W. II. P.
Found on the Continent and in North America.
Obs.— Marsupella sparsifolia, Lindb., which is also paroicous,
is a much larger and robust species, of a darker colour, with lobes
of the leaves obtuse.
Marsujjella olivácea, Spruoe, has more oval leaves with
shallower sinuses,