ENTERIDIUM.] 
rettculariace;e. 
159 
KEY TO THE SPECIES OF ENTERIDIUM. 
Spores warted, clustered. E. olivacmm 
Spores reticulated, free. E. Rozeanum 
1. E. olivaceum Ehrenb., I.e., p. 57 (1818). Plasmodium 
rose-red, in dead wood. JEthalium pulvinate depressed, 1 to 3 
cm. broad, 1 to 3 mm. thick, smooth or rugulose, dark oHve- 
brown; sporangium-walls yellow-olive, subcartilagiuous, 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 warted on one side, 9 to 12 ^u, diam. 
— Post., Mon., p. 227 ; Cooke, Myx. Brit., p. 56; Mass., Mod., 
p. 44. Licoithalium olivaceum P,ost., Versuch, p. 4 (1873). 
Reticularia a])planata 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. ^thalium, half natural size ; 5. perforated sporangiuin- 
walls, and spore clusters, x 80 ; c. spore cluster, x 600 (England). 
Intermediate forms occur between E. olivaceum and Licea flexuosa 
(see note, p. 150), which indicate an alliance between the two species. 
Hah. 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 
sethalium perforated, forming a network of broad membranous 
bands, together with the spores red-browti. Spores reticulated on 
two-thii'ds of the surface, the remaining part faintly warted, 7 to 
9 jx diam. — Macbride, in Bull. Nat. Hist. Iowa, vol. ii., p. 117 ; 
Mass., Mon., p. 46. Reticularia (?) Rozeana Post., Mon., App., 
p. 33 (1876). 
Plate LIX., A. — d. ^thalium ; 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 
Host. 
Hal. 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 Rostmpii Eaunk., in Bot. Tidssk, xvii., p. 106 
(1888). ^thahum irregularly extended, 4 cm. broad, composed 
of one layer of sporangia, 1 mm. liigh ; olive-green, the side walls 
of the sporangia perforated with large oval openings. Spores in 
