LINDBLADIA.] 



HETERODERMACE/E. 



137 



Sporangia stalked; sporangium- wall with thickenings in the form 

 of a delicate persistent net expanded at the nodes. 



(23) CRIBRARIA. 



Fig. 31. Crilraria anrantiaca Schrad. 



a. Group of sporangia. Twice natural size. 



b. Sporangium after dispersion of the spores. Mag- 



nified 20 times. 



Sporangia stalked; sporangium-wall with thickenings in the form 

 of nearly parallel ribs extending from the base to the apex, 

 connected by delicate threads. 



(24) DICTYDIUM. 



Fig. 32. Dictyflium iimbilicatum Schrad. 



a. Group of sporangia. Twice natural size. 



b. Sporangium after the dispersion of spores. Mag- 



nified 20 times. 



a 



Fig. 32. 



Genus 22. LINDBLADIA Fries, Summa Veg. Scand., p. 449 

 (1849). Sporangia minute, either combined to form an sethalium, 

 or closely compacted ; rarely free, sessile, or stalked ; sporangium- 

 wall membranous, uniform, beset with microscopic, dark, plas- 

 modic granules. 



1. L. Tubulina Fries, I.e. (1849). Plasmodium? Sporangia 

 minute, combined to form a more or less complex, effused or 

 pulvinate sethalium, 1 to 10 mm. thick, black with a cortex of 

 imperfectly developed spores, or umber-brown with the surface 

 formed by the membranous walls of the convex summits of the 

 component sporangia ; hypothallus strongly developed, of mem- 

 branous, more or less spongy tissue ; sometimes the sporangia are 

 shortly cylindrical and closely compacted, sessile, 0*3 to 0'5 mm. 

 broad ; in rare instances they are free and shortly stalked ; 

 sporangium- wall membranous., yellow-brown, uniform, beset with 

 scattered clusters of dark, round, plasmodic granules, 1 /z cliam. 

 Stalk, when present, short, dark brown, rugose. Spores och- 

 raceo as-brown, faintly warted, 4 to 6 /x diam. Licea effusa Ehr., 

 Sylv. Myc. Berol., p. 26 (1818). Lindbladia effusa Host., Mon., 

 p. 223 (1875); Cooke, Myx. Brit., p. 55; Macbride, in Bull. Nat. 

 Hist. Iowa, ii., p. 115 ; Rex, in Bot. Gaz., xvii., p. 201. Tubulina 



