104 ENDOSPORE,. [SPUMARIA. 



The following species are excluded by Rostafinski for what 

 appear to be sufficient reasons (see Host., Mon., p. 229-301) : 



D. Lin Mi Fr. 



D. muscicola Link. 



D. nanum Fr. & Wein. 



D. parietinum Schrad. 



D. plicatum Corda. 



D. Weinmannii Fr. 



D. Sowerbyi Berk., in Sin. 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.flavicomum Mass. 



D. granuliferum Phill. 



D. obrusseum Berk. & Curt. 

 D. paraguayense Speg. 

 D. pezizoideum Mass. 

 D. sinapinum Cooke. 

 D. spumarioides Fr. 



D. tenerrimum Berk. & Curt. 

 D. Zeylanicum Berk. & Br. 



= Trichamphora pezizoidea Jungh . 

 = Physarum globuliferum Pers. 

 = Physarum compressum A. & S. 

 = Physarum pulchripes Peck. 

 = Physarum Berkeleyi Host. 

 = See note after Lepidoderma 



Carestianum Host. 

 = Physarum polymorphum Host. 

 = Craterium rubescens Rex. 

 = Trichamphora pezizoideaJtingh . 

 = Physarum virescens Ditm. 

 = Chondrioderma spumarioides 



Host. 



= Physarum polymorphum Host. 

 = Trichamphora pezizoidea Jungh. 



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 Didymium. 



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 covering of 

 crystals of lime ; 2 to 4 c.m. long, 1 to 2 c.m. wide, and about 

 1 c.m. thick. Sporangium-wall membranous, purplish or colour- 

 less. Columella membranous, hollow, compressed, following in 

 its branches the form of the confluent sporangia, sometimes 

 absent. Capillitinm a network of widely branching, anastomosing, 

 stout, purplish-brown threads, with numerous dark 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 



