1 05 
LEPIDODERMA.] DIDYMIACE^. 
of the sporangia or continued into the capillitium threads. 
Spores dull purple, strongly spinulous, 10 to 13 /x diam — Kost., 
Mon., p. 191 ; Cooke, Myx. Brit., p. 45 ; Blytt., Bidr. K. Norg., 
Sop. iii. (1892), p. 7; Macbride, in Bull. Nat. Hist Iowa, u., 
p. 144. Reticularia alba Bull., Champ., p. 92, t. 32b (i/Ji). 
Plate XLI., A.-a. ffithalium, x 2 ; J. cluster of sporangia from an 
^thalium ; in three places they are broken and show the hollow columella, 
X 20 ; c. capillitium and spores, x 280 ; d. crystals from the investing 
covering of lime, x 280 ; e. spore, x 600 (England). 
Allied to Diclymnm through D. crustaceum, but separated by its 
aethalial habit. 
Hab On grass, dead leaves, etc. Common in Europe. Highgate, 
Middlesex (B. M. 161) ; Batheaston, Somerset (B. M. 171) ; Oxford- 
shire (B. M. 1083, 1084, 1085) ; Cromarty, ScotlaniJ (B. M. 1088) ; 
Ireland (K. 584) ; France (B. M. 997) ; Belgium (B. M. 594) ; Germany 
(B. M. 599) ; Finland (B. M. 597) ; Poland (Strassb. Herb.), Ohio 
(L:B.M.79); Iowa (L:B.M.79). 
The description of Spumaria Micheneri Berk., in G-rev., vol. ii., p. 52, 
is too brief in the absence of the type to be of value. 
Genus 14.— LEPIDODERMA de Bary, in Eost., Versuch, p. 13 
(1873). Sporangia stalked, sessile, or plasmodiocarps ; sporangium- 
wall cartilaginous, beset with superficial crystalline scales ; capil- 
litium profuse, without lime. 
KEY TO THE SPECIES OF LEPIDODERMA. 
Sporangia subglobose . . . . D. tigrinvm. 
Sporangia forming plasmodiocarps . L. Garestianum. 
1. L. tigrinum Eost., Versuch., p. 13 (1873). — Plasmodium 
yellow {teste Schroeter). Sporangia subglobose, flattened and 
umbilicate beneath, stipitate or sessile, scattered, 1 to 1*5 mm. 
diam., olive- or purplish-grey, glossy, more or less closely beset 
with rounded or angular crystalline scales of lime, which are 
sometimes wanting; sporangium- wall cartilaginous, of two 
closely combined layei's, orange -yellow. Stalk stout, cylindrical 
0*2 to 04 mm. thick, furrowed, orange-brown, of a spongy texture 
within, containing deposits of lime ; rising from a hypothallus 
which is either vein-like, or effused and of a loose reticulated 
structure. Columella hemispherical, brown, of the same texture 
as the stalk, containing deposits of lime in rounded nodules. 
Capillitium profuse, of straight or flexuose threads, sparingly 
branched, dark purple-brown or grey. Spores dark purplish- 
grey, minutely and closely spinulose, 8 to 13 /x diam. — Mon., 
p. 187; Cooke, Myx. Brit., p. 44; Blytt, Bidr. K. Norg., 
Sop. iii., 1892, p. 7; Mass., Mon., p. 253. Didymium tig rinum 
Schrad., Nov. Gen. PL, p. 22 (1797). Lepidodermafulvum Mass., 
Mon., p. 253. ^ ^ \ > J 
Plate XLI., B. — a, sporangium, x 20 ; 5. fi-agment of sporangium- wall 
with crystalline discs, x 50 ; capillitium and spores, x 280; d. spore. 
X 600 (Germany). ' ^ ^ 
