332 A Monograph of the Myxogastres. 



Tilmadoche Berkeley!, Mass. 



Sporangia globose, very slightly or not at all umbilicate 

 below, dark blue-grey, frosted with minute particles of lime ; 

 stem blackish-brown, slender, attenuated upwards, thick at the 

 base, and passing into a very distinct, circular, pah brmvn hypo- 

 thallus, longitudinally wrinkled, filled with granules of lime and 

 masses of organic matter, usually straight; capillitium dense, 

 threads 3 4 p. thick, pale yellowish-brown, combined to form 

 a very irregular network, swollen portions very rare, small, and 

 with only a few scattered granules of lime, apparently entirely 

 absent; spores globose, lilac-brown, very minutely warted, 

 11 12 ft diameter. 



Physarum columbinum, Fr. 



A specimen so named by Berkeley, but certainly not that 

 species. 



(Type in Herb. Berk., n. 10,813.) 



On twigs. New England, U. S. 



Gregarious, growing often in rows, 2 2'5 mm. high. 



Tilmadoche compacta, Wing. 



Sporangia brownish-white, flattened, globose, occasionally 

 globose, nodding, borne on subulate, yellowish-white stipes, which 

 have a brown or blackish base, and reach to a height of three 

 or four times the width of the sporangium ; sporangium wall 

 studded with numerous, snow-white lime-granules, the remainder 

 of the wall bronze-colour, with a metallic lustre, splitting on 

 maturity in a floriform manner, with from six to twelve laciniae ; 

 capillitium, after removal of the spores, white, with a faint 

 bluish tint under reflected light owing to the traHslucence or 

 iridescence of its delicate threads; the latter originate from a 

 central lime-granule which is generally quite large, branch 

 several times as they proceed towards the surface of the spor- 

 angium, and join into a dense, compact net, the ends of the 

 last branches attached to the inner side of the sporangium wall ; 

 lime-granules in the capillitium, very few, small, white, fusi- 



