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278 PLANTiE CELLULOSE APHYLLEiE.
Thallus solid, fleshy; covering
membranaceous: sporidia scattered
within the substance SARCOTHECE^. 10.
Thallus cellular, fleshy ; sporidia
in oblong thccae
naceous covering
on the membra-
HYMENOTHECEiE. 11.
Thallus fleshy ; sporidia in longitudinal
thecse
covering
on the deliquescent
LYTOTHECE^. 12.
Fam.I. 1. HYDROPHYTyE. Algarum pars.lAnn^&xxs
and Jussieu.
Thallus tubular, membranaceous, leatherlike or gelatinous,
continuous or jointed; tubes filled with sporidia;
sporidia globose or elliptical ; plant aquatic, rarely marine.
A. Thallus not jointed ; sporidia transverse^ in a single
longitudi?ial row, ivithin the tuhe. Oscillatorideae.
Threads gelatinous, simple, several together
enclosed in a cylindrical sheath . . . Vaginaria. 1.
Threads gelatinous, simple, decumbent,
upon a gelatinous stratum Oscillatoria. 2.
Threads gelatinous, simple, decumbent,
free, tranquil Humida. 4.
Threads gelatinous, tufted, upright,
free, tranquil Elisa. 4.
Threads gelatinous, upright from a
common centre, forming a mass Rivularia. 5.
Threads leatherlike, free Scytonema. 6.
B. Thallus not jointed ; sporidia in many transverse annular
series. Banidece.
Sporidia globular Girardia. 7.
C. Thallus not jointed ; sporidia in tufts, on the- inside of
the title. Lemanideae.
Threads torulose; sporidia elliptical Lemania. 8.
D. Thallus not jointed ; sporidia scattered in the tuhe and
branches. Vaucherideae.
Thallus pinnate; branches linear Bryopsis. 9.