The Myxomycetes of Eastern Iowa. 115 



ous clusters, cylindrical, sometimes nearly half a centimeter 

 high, rounded at the apex, slightly iridescent. Spores rusty 

 brown, spherical, finely warted, .0075.1 July — September. 



The spores are described as minutely or delicately ver- 

 ruculose; when very highly magnified, they appear to me 

 netted. The same impression is given when the spore is 

 examined under a magnification of even 600 diameters, if the 

 lens be good. On moss patches. Not common. 



LINDBLADIA, Fries. 



-i^thalium naked, formed of the irregularly polygonal coal- 

 escent sporangia. The outer walls of the outer peridia unite 

 to form a common covering, generally papillose. 



4. LiNDBLADiA EFFUSA, Ehreuberg. Plate I, Figs. 3 and 3a. 



^thalium naked, seated upon a common strongly devel- 

 oped hypothallus, spread in an ochraceous or olive-tinted 

 mass, sometimes covered with a pitch-black, shining papillate 

 crust. Spore-mass ochraceous-brovvn, the spores spherical, 

 bright-colored, smooth. 



Following N. A. F. No. 1700, I have referred our Iowa 

 material to this species though not without serious misgivings. 

 The description given above from Rostafinski is not specially 

 applicable in several important particulars. In the first place 

 in our forms the plasmodium gives rise not to a true ^thalium 

 but to a single series of sporangia whose peridia at maturity 

 remain distinguishable, are 7iot covered by a common invest- 

 ment, but exhibit quite as much individuality as the similar 

 structures in Ttibulina. Mr. A. P. Morgan (in litt.) avers the 

 identity of our material with Perichcena ccespitosa, Pk. (Rep. 

 State Museum, 31, p. 75) and suggests the name Tubulina 

 coespitosa, Pk., as recording the proper disposition of the case. 



I All spore measurements will be understood as indicating so many thou- 

 sandths of a millimeter. 



