Tilmadoche. 331 



Appears to be a variety of T. nutans, with a blackish-brown 

 sporangial wall. 



(Rostafinski's Synonyms.) 



Miicor, Fl. Dan., t. 467, f. 3 (1770). 



Trichia nutans, Trent., I.e., p. 227. 



Physarum solutum, Schum. Fl. Saell., n. 1446 ; Fl. Dan., t. 



1974, f. 1. 



Physarum sulwlatum, Schum., Fl. Saell., n. 1437. 

 Physarum globosum, Schum., Fl. Saell., n. 1442. 

 Physarum furfuraceum, Schum., Fl. Saell., n. J445. 

 Physarum globosum, Sommf., Fl. Lap., p. 243 (1825). 

 Physarum graeilentum, Fr., I.e., iii., p. 133 (1829). 

 Didymium furfur aceum, Fl., I.e., iii., p. 116. 

 Tilmadoche, soluta, Fr., Sum. Veg. Scand., p. 454 (1849). 



Tilmadoche columbina, Rost. 



Sporangia globose, or spherico-depressed, usually more or less 

 umbilicate below, at first pale grey or whitish, delicately frosted 

 with minute white particles of lime, dark grey and slightly 

 iridescent after the lime has been removed; stem 3 4 times 

 as long as height of sporangium, snow-white, tapering upwards, 

 straight or slightly inclined above, longitudinally wrinkled, rigid, 

 filled with particles of lime ; columella absent ; capillitium well 

 developed, threads thin, colourless, combined to form an irregular 

 network, furnished here and there with small, elliptical, inter- 

 stitial swellings containing colourless granules of lime ; angles 

 of bifurcation not swollen ; spores globose, pale dingy lilac, very 

 minutely verruculose, 10 11 /u, diameter. 



Tilmadoche columbina, Rost., Mon. App., p. 13 ; Sacc., Syll., 

 vii., 1, 1249. 



Didymium columbinum, B. and C., in Herb. 



(Type from which Rostafinski founded the species in Herb. 

 Berk., Kew, n. 10,767.) 



Gregarious on rotten wood. Venezuela. 



About 2 mm. Irish. 



