The Myxomycetes of Eastern Iowa. 135 



frequently branched, shows no free ends; has in fact the gen- 

 eral appearance of an Arcyn'a except that the tubes are 

 spirally banded, and are generally smooth. 



30. Hemiarcyria serpula, ScofoU. Plate V, Figs, 3, 3a 



and '^h. 



Plasmodiocarp depressed, sessile, creeping, commonly united 

 into a loose net, bright-yellow, as also the spore-mass and capil- 

 litium, branched, tubes about half as wide as the diameter of 

 the spores, the spiral bands armed with abundant rather stout 

 spinules. Spores covered with net- work, .012-.013. 



Rather common in September and October on rotten loo's, 

 stumps, etc., in the woods. The vein-like elements of the 

 plasmodiocarp usually unite in every direction to form an ele- 

 gant net a centimeter or two in diameter, but may instead 

 wind aimlessly about, forming naught but loops or hooks, or 

 wavy Hnes. A very pretty and curious organism, figured by 

 Corda [Icones, Plate II, Fig. 34) under the winding title of 

 Hyporrhamma retiadatiun, and described by Fries as Trichia 

 scrpida. On maturity the peridial membrane breaks irregu- 

 larly along the medial line revealing the golden yellow spores 

 and capillitium, the latter remarkablv hygroscopic, constantly 

 in motion. The spores are beautifully netted, reminding one 

 of the spores of Oligoner.ia. 



31. Hemiarcyria stipata, Sch-.vehiitz. Plate I, Figs. 8, ^a 



and Sb. 



Sporangia distinct, though often crowded, stalked, cylindric, 

 rich brown or copper-colored, shining, borne on a more or 

 less distinct hypothallus. Peridium thin, the upper portion at 

 maturity irregularly evanescent, the base persistent as a shallow 

 cup. Spore-mass and capiUitium reddish; capillitium united 

 in a loose net with many free and bulbous ends, the tubes 

 pale, granular within, marked without by obscure spiral bands 



