Download PDF

PLcell.aph. 1. HYDROPHYT^E. 5. Rivularia. 285
' black-green
Stones and posts in the sea, also on fuci.
Tufts 1 or 2-tenths of an inch in diameter, mostly single.^
2. Rivularia natans. Floating rivulet-moss.
Fresh-water ; tufts globular, hollow; threads stiff, not
branched, attenuated ; sporidia nearly globular.
Tremella utriculata, Huds. Fl.Angl. 564.
Tremella natans, Hedwig Theor. gen. 2,218.
Rivularia angulosa, Roth Cat. 3, 340.
Ulva pruniformis, Eng. Bot. 968, not of Linnaeus.
Boggy ditches and ponds.
Tifts of various sizes, brownish or greenish ; threads
very stiff, attenuated ; sheath thin, transparent at the base
of the threads.
3. Rivularia dura. Hard rivulet-moss.
Fresh-water ; tufts globular, solid, hard, green ; threads
not branched, straight, agglutinated together at bottom,
free above, awlshape ; rings inconspicuous.
Tremella globulosa, Roth Fl. Germ. 3,551.
Tremella verrucosa. Roth Fl. Germ. 3, 554.
Rivularia dura. Roth Cat. 3,338.
On aquatic plants ; annual ; summer.
Tifts the size of a large pin's head.
4. Rivularia nitida. Shining rivulet-moss.
Fresh-water ; tufts hemispherical, solid, hard, shining,
; threads very close, equal, very slender, light
green.
Rivularia calcarea, Engl. Bot. MQQ.
Rivularia nitida, Agardh Disp. ed. J , 44.
Inundated places and sides of rivers.
Tifts about a quarter of an inch in diameter, often
uniting and forming an uneven bed,
VI. 6. SCYTONEMA. Agardh. _
'
Leather-thread,
Threads nearly leatherlike, free, not gelatinous, simple
or branched, orange-colour in dark and blackish tufts.—
Inundated places ; appearing like lichens, and being perhaps
the young state of some of their families.
a. Branches given out at right angles,
1. Scytonema myochrous. Mouseskin leather-thread.
Threads olive yellow, very closely entangled into a
blackish brown mat ; branches in pairs, simple, facing one
way ; sporidia. ringlike.