136 Natural History Bulletin. 



and occasional wart-like or plate-like thickenings (Arcyrioid). 

 Spores smooth, about .006. Decorah. Mr. Holway. 



A beautiful species, recognizable at once by its large size 

 and bright color, a deep brown carmine - tinged. Arcyria 

 adnata shows sometimes similar tints, but the sporangia are 

 more crowded and much smaller. The capillitium is puzzling. 

 With numerous free ends it yet exhibits only faint spiral 

 bands; distinct enough under a Leitz No. 7, much better 

 under a one-sixteenth immersion. It is one of those boundary 

 forms which appear to belong about equally on either side of 

 our lines of generic demarcation. The spiral threads are 

 however a good character, fortunately in the present in- 

 stance reinforced by the indubitably free bulb-like tips. Not 

 to be confused with Mr. Massee's H. stipitata, which is simi- 

 lar in the specific name only. 



VI. RETICULARIACEiE. 



Fruiting phase an athalium, covered by a distinct paperj^ 

 membrane. Spore-mass and capillitium brown or violet-black. 



Spores and capillitium brown, Reticularia. 



Spores and capillitium violet-black — not represented in 



our locality, Amauroch^te. 



RETICULARIA, Bulliard. 



Fructification at maturity forming a large cushion-like aetha- 

 lium. Spore-mass and capillitium umber-brown. 



32. Reticularia lycoperdon, Bulliard. Plate III, Fig. 3, 

 and Plate X, Figs. 7 and *]a. 



Plasmodium white or yellow, branching, at length forming 

 a white slimy mass. Mature ^thalia, three to six centimeters 

 in diameter, covered with a shining, silvery, paper-like, peridial 

 membrane, and seated on a well developed hypothallus. 



