186 Mycetozoa of North America 



Suborder I. DICTYDIINEAE 



Capillitium absent or not forming a system of uniform threads, 

 except in Alwisia. 



Family I. CRIBRARIACEAE 



Sporangial wall membranous, studded with round, micro- 

 scopic granules (plasmodic granules) ; the wall either continuous 

 or forming a net in the upper part; capillitium and columella 

 absent; spores usually 4-7 y. diam. 



Sporangia sessile, closely compacted or in the form of an 



aethalium, the walls not forming nets in the upper part. 26. Lindbladia 



Sporangia stalked; sporangial wall with thickenings in the 

 form of a delicate, persistent net usually expanded at the 

 nodes. 27. Cribraria 



Sporangia stalked; sporangial wall with thickenings in the 

 form of nearly parallel ribs extending from the base to the 

 apex, and connected by delicate transverse threads. 28. Dictydium 



Genus 26. LINDBLADIA Fries, Summa Veg. Scand. 449. 

 1849. 



Sporangia either combined to form an aethalium or closely 

 compacted, rarely free; sporangial wall membranous, studded 

 with dark, plasmodic granules. 



A SINGLE SPECIES. 



1. Lindbladia eflfusa (Ehrenb.) Rost. Mon. 223. 1875. 

 Licea effusa Ehrenb. Sylv. Myc. Berol. 26. 1818. 



Plasmodium brownish black (Lister). Sporangia cylindrical, 

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

 pulvinate aethalium 1 to 25 cm. across, 2 to 10 mm. thick, either 

 black with a cortex of imperfectly developed spores, or umber- 

 brown and the surface formed by the convex summits of the com- 

 ponent sporangia, each about 0.4 mm. diam. ; hypothallus strongly 

 developed, membranous, forming a more or less spongy tissue; 

 sporangial walls entire or perforated, membranous, yellowish 

 brown, studded with dark plasmodic granules grouped in clusters 

 or forming irregular veins. Spores ochraceous brown, faintly 

 war ted, 4-6 n diam. 



