ENTERIDTUM.] RETICULARIACE^E. 159 



KEY TO THE SPECIES OF ENTERIDIUM. 



Spores wartecl, clustered. E. olivaceum 



Spores reticulated, free. E. Rozeanum 



1. E. olivaceum Ehrenb., I.e., p. 57 (1818). Plasmodium 

 rose-red, in dead wood. ^Ethalium pulvinate depressed, 1 to 3 

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

 brown ; sporangium- walls ^yellow -olive, subcartilaginous, per- 

 forated with wide openings forming a network with broad winged 

 boundaries to the meshes. Spores in clusters of 6 to 20, rarely 

 free, pale olive, thickened and wartecl on one side, 9 to 12 /x diam. 

 Rost., Hon., p. 227 ; Cooke, Myx. Brit., p. 56 ; Mass., Mon., 

 p. 44. Liccethalium olivaceum Host., Versuch, p. 4 (1873). 

 Reticularia applanata Berk. & Br., Ann. Mag. Nat. Hist., Ser. 3, 

 xviii., p. 56, t. ii., f. 3 (1866). Enteridium simulans Host., Mon., 

 App., p. 30. 



Plate LIX., A. a. sethalium, half natural size ; b. perforated sporangium- 

 walls, and spore clusters, x 80 ; c. spore cluster, x 600 (England). 



Intermediate forms occur between E. olivaceum and Licea flc.xuom 

 (see note, p. 150), which indicate an alliance between the two species. 



Ilab. On dead wood. Ascot, Berks (B. M. 14, 15, 16) ; Kent 

 (B. M. 13) ; Boynton, Yorkshire (B. M. 1158) ; Glen Tanner, Scotland 

 (K. 1670) ; Poland (Strassb. Herb.) ; New Jersey (K. 835). 



2. E. Rozeanum Wing., in Proc. Ac. Nat. Sc. Phil. (1889), 

 p. 156. Plasmodium? Sporangia hemispherical or subglobose, 

 5 to 30 mm. diam., red-brown; sporangium-walls within the 

 fethalium perforated, forming a network of broad membranous 

 bands, together with the spores red-brown. Spores reticulated on 

 two-thirds of the surface, the remaining part faintly warted, 7 to 

 9 (j. diam. Macbride, in Bull. Nat. Hist. Iowa, vol. ii., p. 117 ; 

 Mass., Mon., p. 46. Reticularia (?) Rozeana Bost., Mon., App., 

 p. 33 (1876). 



Plate LIX., A. d. asthalium ; half is seen in vertical section, showing the 

 persistent sporangium-walls and the barren base, x 3 ; e. perforated 

 sporangium-walls, x 80 ; /. spores, x 400 (United States). 



Mr. Wingate states that specimens received by him from M. Roze, 

 of Paris, identify the American gatherings with Reticularia Rozeana 

 Rost. 



Hab. Philadelphia (L:B.M.130) ; Ohio (L:B.M.130) ; Iowa (L:B,M. 



130). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



3. Enteridium Rostrupii Raunk., in Bot. Tidssk, xvii., p. 106 

 (1888). ^Ethalium irregularly extended, 4 cm. broad, composed 

 of one layer of sporangia, 1 mm. high ; olive-green, the side walls 

 of the sporangia perforated with large oval openings. Spores in 



