DICTYDI^THALIUM.] RETICULARIACE.E. 157 



Walls of convoluted sporangia perforated and forming a uniform 

 tissue of interarching bands. 



(31) ENTERIDIUM. 



Fig. 39. Enteridium olivaceum Ehrenb. 



a. Plasmodiocarp. Magnified twice. 



b. Part of spurious capillitium. Magnified 35 times. 



c. A spore cluster, and one isolated spore. Mag- 



nified 210 times. 



Walls of convoluted sporangia incomplete, forming tubes and 

 folds with numerous anastomosing threads. 



(32) 



Fig. 40. Rcticidaria Lycopcrdon Bull. 



a. jEthalium. Natural size. a 



b. Fragment of capillitium. Magnified 100 times. 



Fig. 40. 



Genus 30. DICTYDLETHALIUM Rostafmski, Versuch, p. 5 

 (1873). ./Ethalium flat, formed of erect columnar sporangia; 

 sporangium-wall dome-shaped at the apex, continued down to the 

 hypothallus in four to six straight threads; capillitium none. 

 CLATHROPTYCUIUM Rost., Mon., p. 225 (1875). 



1. D. plumbeum Rost., I.e., p. 5 (1873). Plasmodium rose-red, 

 in rotten wood. ^Ethalium 1 to 3 cm. broad, - 5 to 1 mm. thick, 

 dull slate-coloured or clay-coloured, iridescent, areolated with the 

 convex apices of the sporangia ; sporangia cylindrical, angled by 

 mutual pressure, O5 to 1 mm. high, O2 mm. thick ; sporangium- 

 wall persistent and dome-shaped at the apex, subcartilaginous, 

 continued down to the hypothallus in four to six straight threads, 

 2 to 4 fjL thick, triangular in section ; evanescent between the 

 threads. Spores clay-coloured or yellow in mass, when magnified 

 pale yellow, spinulose, 9 to 12 //, diam. Fuligo plumbea Schum., 

 Enum. PI. Saell., ii., p. 193 (1803). Reticularia plumbea Fr., 

 Syst. Myc., iii., p. 88. Licea rugulosa Wallr., Comp. Fl. Germ., 

 iv., p. 345 (1833). Clathroptychium ruyulosum Rost., Mon., 

 p. 225, App., p. 30; Cooke, Myx. Brit., p. 55; Blytt, Bidr. K. 

 Norg., Sop. iii., p. 9; Macbride, in Bull. Nat. Hist. Iowa, ii., p. 117 ; 

 Mass., Mon., p. 51. Licea applanata Berk., in Hook., Journ. Bot. 



