The Myxomycetes of Eastern Iowa. 133 



ticulars to the description as above. The sporangia are as 

 often reniform as spherical; the elaters often bifid at tip as in 

 Fig. 5^ referred to above. October. 



27. Trichia iowensis, Macbride^ n. s. Plate V, Figs. 4, 



/\a and 4*5; and Plate X, Fig. 5. 



Sporangia sessile, gregarious, spherical or reniform, with 

 no hypothallus, purple-brown. Spores and spore-mass, yel- 

 low. Elaters with three or four spiral bands unevenly dis- 

 tributed, and with occasional inflations, sparingly branched, 

 spinulose especially where inflated; spinules long, .003-.006, 

 and recurved, often bifid or trifid, especially at or near the 

 acuminate tip. Spores delicately warted, .009-.011. 



This species occurs rarely; is found on the bark oi Poj>uIus, 

 so far, exclusively. The sporangia are inconspicuous until 

 opening by fissure they display the yellow spores and capil- 

 litial threads. The species is immediately recognized by its 

 elaters whose numerous and lengthened spinules are unlike 

 those of any cognate form, reminding one of the capillitium of 

 CorniLvia. Woods, near Iowa City; October. 



HEMIARCYRIA, Rostafinshi. 



Capillitium united into a net, either free, or by its lower 

 branches bound back to the stem or to the basal part of the 

 peridium. Peridium opening irregularly. Threads of the 

 capillitium spirally banded. 



28. Hemiarcyria rubiformis. Per soon. Plate V, Figs, i, 



la and ih, 



Plasmodia! and fruiting phases alike ruby-red. Sporangia 

 stalked, turbinate or piriform; stems commonly coalescent so 

 that the sporangia are clustered. Peridium at first shining 

 with metallic lustre, at length duller. Spore-mass and capilli- 

 tium reddish-brown; capillitium net with many free, pointed 



