Hah. Springs on the moors near Wolsingham, Durham:
Ah'. Backhouse. In a bog on Tower Hill Common, near
Southampton: J. Woods, Esq. West Blanket Island,
Kerry : 3h'. Andrews. Aberdeen: Dr. Dichie.
“ I t is composed of dense tufted masses of a dull brown,
except when held against the light, in which position they
appear of a horny or dirty orange hue. They are of a rigid
substance, and do not adhere to paper in drying. The copious
branches are irregular, wavy or curved, the ultimate
ones blunted, and many of them turned one way. The
greatest peculiarity of this species is that a chain-like row
of vesicles runs along the centre of the frond, each of which is
marked with a central dot, probably consisting of a mass of
seeds.” — K. B.
2. H assallia compacta Hass.
Plate L X V I I I . Fig. 3.
Char. “ Filaments decumbent, branched, densely interwoven
into blackish tufts. Branches suberect, dichotomous, and
fasciculate within, furnished with transverse rings.” —
Grev.
Scyt. compactum Harv., 1. c. p. 364.; also in Manual, p. 154.
Hab. Moist rocks in the Pentland H ills : Messrs. Arnott
and Greville.
This species, with a specimen of which I have been kindly
favoured by Dr. Greville, does not differ very considerably
from H. ocellatum, and chiefly in the closer arrangement of
the sporidia. I am not certain that it is really distinct.
3. H assallia turfosa Hass.
Char. Frond coriaceous, sparingly branched. Branches sub-
erect. Cells annuliform, rarely beaded. Sheath broad.
Dematium turfaceum Pers. Myc. Fur. vol. i. p. 68 .; F k.
Sp. PI. i. 134.; F . B. 2826. fig. 1.
Hab. On heath, sphagnum, &c., on the Pentland Hills,
found by Dr. Greville.
“ Forming a short brownish shaggy stratum, overrunning
the plants on which it grows. Threads suberect, giving out
in a proliferous manner short, very obtuse, branches of a beautiful
golden yellow brown. Two sometimes spring from the
same point. The walls of the threads are very thick. Sporangia
annuliform, green, composed of a compact grumous
mass, or divided, especially in the older tlireads, into a single
row of distinct oblong granules.
“ This very, beautiful Alga was communicated by Dr.
Greville to Sir W. J . Hooker, in whose Herbarium it is
marked by M. Klotzsch Dematium turfaceum Lk., which
there is every reason to believe is correct. L ink appears to
have been acquainted with the plant merely from the short
notice of it by Persoon in the ‘ Mycologia Europæa.’ Fries
tells us expressly, ‘ Syst. Myc.’ vol. ii. p. 603. a.d not, that it is
an Alya. I t is indeed a true Scytonema, which bears much resemblance
to Petalonema alatum, though it wants the characteristic
feature of tha t very curious production. Badulum ater-
rimum of F ries, of which specimens are published in ‘ Scleromy-
cetes Sueciæ’, and to which Persoon’s var. cornutum is referred,
is altogether different, and truly a fungus.” •— M. J. B.
This beautiful species hears some resemblance to H. ocellatum
and still more to H. compactum ; the cells, however,
are rarely beaded, as they invariably are in both those species.
I t is no doubt distinct from either, the branches are
generally single.
4. H assallia ? byssoidea Hass.
Plate L X V I I . Fig. 5.
Char. Filaments minute, erect, simple, o f equal diameter, fa s ciculate,
obtuse, forming an unequal blackish crust. Striæ
very close and evident.
Scyt. byssoideum Berk., Glean. Alg. t. 19. f. 1. ; Haiw.
Hook. Brit. Fl. p. ii. p. 366. ; Harvey, in Manual.