I lsideree!
by Dr. Spruce as a variety of P. albescens (Hook.), but as
it grows under similar conditions and at the same altitude,
retaining the distinctive characters above mentioned, I look upon
it as a distinct species.
D e s c rip tio n op P l a t e LXXVL—Fig . 1. P la n ts n a tu ra l size.
2. Portion of stem, antioal view x 31 (Loch-na-gar, J. Sim).
3. Ditto, postical view x 64 (ditto). 4-6. Leaves x 64 (ditto).
7, 8. Ditto X 85 (L a p l a n d , Angstrom). 9. Portion of leaf x 290
(Loch-na-gar, J. Sim). 10, 11. Stipules x 85 (Lapland,
Angstrom). 12-15. Ditto x 64 (Loch-na-gar, J. Sim).
16-18. Sub-bracts x 31 (Lapland, Angstrom). 19, 20. Bracts x
31 (ditto). 21. Bracteole x 31 (ditto). 22. Perianth x 24
(ditto). 23. Cross-section of perianth, near the base x 24 (ditto).
24. Ditto, upper half of perianth x 24 (ditto). 25. Portion of
mouth of perianth x 85 (ditto).
Genus 17. HYGROBIELLA, Spruce.
.Tungermania, Hook. Brit. Ju o g . (1816).
Gymnocolea, Dum. Recueil (1835).
Cephalozia, Lindb. Muse. Scand. (1879).
Ilygrohiella, Spruce, On Cephalozia (1882).
Plants small, cæspitose. Stems somewhat thick but fragile,
transverse sections about 6 cells in diameter, cortical cells about
14, at the base rhizomatous and flagelliferous ; rootlets very few
or absent ; above sparingly branched ; branohes lateral and axillary.
Snbfloral innova,tions lateral or postical, often repeatedly innovant
and floriferous. Lower leaves minute, distant, upper larger and
closer, all transverse, complicato-bilobed, lobes equal or antioal
slightly smaller ; cells large and elongate. Stipules smaller than
the leaves, somewhat similar or rarely entire. Inflorescence
dioicous. $ terminal on stem or branch. Bracts few pairs,
tristichous. Perianth large, suhcarnose, fusiform, distinctly
obtusely trigonous, mouth small, subentire. Calyptra narrow
above. Capsule oblong, bistratose. Elaters bispiral. Spores
minute. Bracts $ terminal, few pairs, somewhat similar to the
leaves, monandrous.
O b s .—The genus llygrobiella, Spruce, originally contained
three species, Jung, laxifolia, Hook., Jung, mgriocarpa, Carr.,
and Jung, nevicensis, Carr.; later. Dr. Spruce, not being satisfied
with the position of Jung, myriocarpja in the genus, removed it
to an unpublished genus proposed by the late Prof. Liudberg,
which Dr. Kaalaas has been kind enough to prepare.
■Jung, nevicensis having been found in more perfect condition
than when Drs. Carrington and Spruce had the opportunity of
studying it, proves to be a Marsupella, where it has been placed.
Hygrobiella lax ifo lia {Hook.), Spruce.
Jungermania laxifolia, Hook. Brit. Ju n g . t. 59 (1816).
Gymnocolea laxifolia, Dum. Recueil, p. 17 (1885).
Cephalozia laxifolia, Lindb. Muse. Scand. (1879).
Hygrobiella laxifolia, Spruce, On Cephalozia, p. 72 (1882).
Dioicous, cæspitose, flagelliferous, small, pale green to greenish-
brown in colour. Stems suberect, almost round, cortical cells
14-20, large, inner 6-10 in diameter, smaller remarkably clear
with very dark walls ; often much branched at the base, some
branches short, flagelliferous, denudate or microphyllous, others
assurgent, fastigiate-corymbose below with few and distant leaves,
above (chiefly fertile) leaves closer. Eootlets very few or absent,
proceeding from the flagella or stem. Leaves transversely inserted,
erect, lower ones minute, ovate-subulate, sometimes entire, upper
accrescent, subimbricate, oval and oval-lanceolate, complicate-
canaliculate and equitant, from \ to bifid, segments obtuse or
acute, often unequal, sometimes only emarginate, very' rarely with
a third short segment near the middle. Te.xture lax ; cells rather
large, pellucid, leptodermous, rectangular-hexagonal, two to three
times as long as broad, walls thin but firm, no thickened angles
or trigones. Stipules similar to the leaves, usually a little smaller,
below often entire or emarginate. Flowers $ terminal on stem
or on long or short branches, often repeatedly innovant. Bracts