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I) ::
il
of linae in the form of crystals, or more frequently as minute
amorphous particles. In the sub-seotion Physarcw, which includes
the terminal members of the section, lime is present in
very considerable quantity both on the sporangium and^ in the
threads of the capillitium, whereas in the sub-seotion Bidymeae
lime is abundant on the sporangium, but absent from the
capillitium, although usually present in the columella when the
latter is present. The genus Crateriachea is intermediate
between the two sub-sections as regards the disposition of lime.
In the genus Diaehaea lime is absent from the sporangium,
although present in quantity in the columella and stem, this
genus,°as explained later on, forms a connecting link between
the present section and the GolumeUiferae, and as such, does
not come within the diagnosis of either. Owing to rigidity
due to the abundance of lime, especially in the sub-seotion
Physarae, there are no marked contrivances for spore dispersion,
wbiob appears to be effected by wind on the dissolution of the
sporangium, but in the Bidymeae, where the capillitium is free
from bme and possesses a certain amount of elasticity, the
sporangium frequently dehisces in a definite manner.
B a d h a m i a .
I
C r a t e h i d m .
C l E N K O W S K I A . -
L e o c a r p u s .
- P h y s a e c m .
C h o n d r i o d e r m a .
I
D i d y m i u m .
L e p i d o d e r m a .
T i l m a d o c h e .
Crateriachea.
i
F u l i g o .
I
S p u m a r i a .
! i
D i a c h a e a .
LITHODEBMEAE.
( L a m p r o d e r m a . \
COLUMELLIFEEAE./
ANALYSIS OF THE GENERA.
Sect. LITHODERMEAE.
Sub-sect. Didymeae.
Chondrioderma. Sporangia with a continuous porcelainlike
coat of lime.
D idymium. Sporangia with a pulverulent, crystalline coat
of lime.
Lepidoderma. Sporangia with isolated, large patches of
lime.
Spumaria. Aethalium consisting of sporangia arranged in a
dendritic manner.
D iachaea. Sporangia iridescent, without lime.
Sub-sect. P hysarae.
Badhamia. Threads of capillitium thick, containing lime
throughout th e ir length.
Craterium. Sporangia with a well differentiated lid, or
splitting in a circumscissile manner.
P hysarum. Capillitium with numerous large, irregular nodes
containing lime, and connected by thinner portions without
lime.
Tilmadoche. Capillitmm with small, scattered, elliptical
nodes containing lime internodes thin, elongated, without
lime.
L eooahpus. Sporangia obovate, polished.
Ceinkowskia. Capillitium with curved, free tips.
Crateriachea. Columella present; threads of capillitium
mostly without nodes, containing lime.
F uligo. A cake-like aethalium.
Sub-sect. Didymeae.
Chondrioderma, Eost. (in part).
Sporangium stipitate or sessile, wall single or double, outer
wall charged with lime, perfectly smooth, porcelain-like, dehis