The Myxomycetes of Eastern Iowa. 131 



will have difficulty enough to keep these two species apart, as 

 more and more with the progress of our knowledge inter- 

 grading forms come into sight. Chrysospermatous specimens 

 so far as discovered or examined here, all exhibit spore-reticu- 

 lations reasonably complete; i. e.., we have here the typical 

 T. chrysos-perma. 



A comparatively common and most beautiful species. No 

 yellow more golden; no elaters, more graceful; no spores, 

 more finely sculptured. Zopf reports the plasmodium white. 

 Specimens occur in July and August on substrata of various 

 sorts, — logs, bark, patches of moss, etc. 



24. Trichia affinis, De Bary. Plate IV. Figs. 6c and 6d. 



Sporangia sessile on a more or less distinct hypothallus, 

 spherical or ovoid, crowded together. Spore-mass and capil- 

 litium yellow. Elaters with several spiral bands, rough, with 

 short spinules, the tips more or less swollen, terminating 

 in an acute point. Spores adorned with reticulate bands 

 which are pitted along the median line, .010-.012. 



Under this species we may recognize the varieties following: 



a. T.Jacku, Rost. Differs from the type only in that the spore 



reticulations are less perfect, an occasional free end 

 appearing. 



b. T.abrupta^Q^e. Tips of the elaters bifurcated; /. ^., exhibit- 



ing generally two or more large spinules at right 

 angles to the axis of the elater; spirals not joined by 

 vertical bars; reticulation less perfect but of the 

 pitted order. Figs. 6, 6a and 6b. 



c. T. intermedia^ Mass. Has spores similar to those of T. 



abnipta, but has the spiral bands connected by long- 

 itudinal ridges, and the elater tips are simple, not 

 forked. Figs, i, la, ib and ic. 



The phase common here is the T. affinis^ var. intermedia^ for 

 the spirals are connected; variety abrufta also occurs, and our 



