enteridium] reticulariaceae 197 



as the spores of most gatherings vary in the amount of roughness, 

 this character alone is not sufficient to mark specific difference. 

 Clathroptychium cinnabarimim Sacc. from N. Italy, is described as having 

 vermilion sporangia with blackish-purple opercula and threads ; this 

 description applies to immature specimens of D. plumbeum. 



Hob. On dead wood ; not unfrequent. — Rudloe, Wilts (B.M. 20) ; 

 Batheaston, Somerset (B.M. 292) ; Luton, Beds (B.M. slide) ; Yorks 

 (B.M. 2808); Aberdeenshire (B.M. 2809); France (Paris Herb.); 

 Germany (Strassb. Herb.) ; Hungary (K. 828) ; Portugal (B.M. 2810) ; 

 Ceylon (K. 1664) ; Sikkim (K. 1669) ; Australia (K. 834) ; Phila- 

 delphia (B.M. 3196) ; New Jersey (B.M. 945) ; South Carolina (B.M. 

 928) ; West Indies (B.M. 2811). ' 



Genus 34.— ENTERIDIUM Ehrenberg in Spreng. Jahrb. 

 Gewachs., i. pt. 2, 55 (1818). Aethalium composed of con- 

 fluent interwoven sporangia, their walls perforated with large 

 openings (sporangia more or less free, forming plasmodiocarps 

 in E. olivaceum var. liceoides) ; capillitium none. 



KEY TO THE SPECIES OF ENTERIDIUM. 



Spores warted, usually clustered. 1. E. olivaceum 



Spores reticulated, free. 2. E. Rozeanum 



1. E. olivaceum Ehrenb. I.e., 57. Plasmodium rose- 

 red. Aethalium pulvinate, depressed, 1 mm. to 3 cm. 

 broad, 1 to 3 mm. thick, smooth or rugulose, dark olive- 

 brown, often glossy ; sporangium-walls yellow-olive, sub- 

 cartilaginous, perforated with wide openings forming a net- 

 work with broad winged boundaries to the meshes. Spores 

 in clusters of 6 to 20, sometimes free, pale olive, thickened 

 and warted on one side, 9 to 12 /x diam. — Rost. Mon., p. 227 ; 

 Mass. Mon., 44. Lycoperdon ungulinum Schum. Enum. PL 

 Saell., ii. 192 (1803) ? Reticularia versicolor Fr. Syst. 

 Orb. Veg., i. 147 (1825). R. olivacea Fr. Syst. Myc, iii. 89 

 (1829). R. ungulina Fr. I.e. ? R. applanata Berk. & Br. in 

 Ann. Mag. Nat. Hist., ser. 3. xviii. 56, t. ii., fig. 3 (1866). 

 Licea olivacea Fuckel Symb. Myc, 338 (1869). Licaeihalium 

 olivaceum Rost. Versuch, 4 (1873). Enteridium atrum Preuss 

 in Linnaea, xxiv. 142 (1851). E. simulans Rost. Mon., App. 

 p. 30. E. antarcticum Speg. in Bol. Acad. Nac. Cienc. Cord., 

 xi. 363 (1887) ? E. Rostrupii Raunk. in Bot. Tidssk., xvii. 106 

 (1890). E. macrosperma Raunk. I.e. 



Var. liceoides Lister : sporangia forming long, often branched 

 and net-like plasmodiocarps. — Journ. Bot., xxxiv. 211 (1896). 



PI. 153. — a. aethalium (England) ; b. perforated sporangium-walls and spore 

 clusters ; c. cluster of spores ; d. plasmodiocarps of var. liceoides. 



The var. liceoides is connected with the type by such gatherings as 



that named by Prof. Raunkiaer E. Rostrupii (B.M. 1722), in which the 



aethalium consists of only two or three layers of sporangia. A specimen 



N 



