104 
ENDOSPORE^. 
[SPUMARIA. 
The following species are excluded by Rostafinski for what 
appear to be sufficient reasons (see Rest., Mon., p. 229-301) : — 
D. Linkii Fr. 
D. muscicola Link. 
D. nanum Fr. & Wein. 
D. parietinum Schrad. 
D. plicatum Oorda. 
D. Weinmannii Fr. 
Z>. Sowerhyi Berk., in Sm. Eng. Flora, Fungi, p. 313, must also 
be excluded, as the description is too imperfect to determine what 
it is. 
SPECIES EXCLUDED FROM THE GENUS. 
D. australis Mass. 
D. Barteri Mass. 
D. echinospora Mass. 
D. erythrinum Berk. & Curt. 
D . Jiavicomum Mass. 
D. granuliferum Phill. 
D. obrusseum Berk. & Curt. 
D. paraguayense Speg. 
D. pezizoideum Mass. 
jD. sinapinum Cooke. 
D. spumarioides Fr. 
D. tenerrimum Berk. & Cui't. 
D. Zeylanicum Berk. & Br, 
= Trichaniphorapezizoidea Jungh. 
= Physarum glohuliferuvi Pers. 
= Physarum compressum A. & S. 
= Physarum pulchripes Peck. 
= Physarum Berkeleyi Rost. 
= See note after Lepidoderraa 
Carestianum Rost. 
= Physarum poly morphum Rost. 
= Craterium rubescens Rex. 
= Trichamphora pezizoideaJungh. . 
= Physarum virescens Ditm. 
= Ghondrioderma spumarioides 
Rost. 
= Physa/rum polymorphum Rost. 
= Trichamphora pezizoidea J ungh. 
Genus 13.— SPUMARIA Persoon, Obs. Myc, i., p. 92 (1796). 
The sporangia are confluent to form an sethalium, otherwise the 
characters are those of the genus Didymivm. 
1. S. alba DC, Fl. Fr., ii., p. 261 (1805). Plasmodium 
opaque-white, among grass and dead leaves, ^thalia composed 
of elongated, compressed and folded, lobed and confluent, grey 
sporangia, arising in more or less loosely compacted clusters from 
branching processes of the membranous hypothallus, clothed with 
a thick but fragile and deciduous, white, universal coveriiig of 
crystals of lime; 2 to 4 cm. long, 1 to 2 cm. wide, and about 
1 cm. thick. Sporangium-wall membranous, purplish or colour- 
less. Columella membranous, hollow, compressed, following in 
its branches the form of the confluent sporangia, sometimes 
absent. Capillitium a network of widely branching, anastomosing, 
stout, purplish-browu threads, with numerous dai'k calyciform 
thickenings, hyaline at the extremities where they are attached 
to the sporangium-wall or columella ; these are accompanied 
occasionally with tubular processes of the sporangium-wall, open 
externally, and either completely perforating the flattened lobes 
