150 Mycetozoa of North America 



duced then. S. fenestrata Rex is a form with a weak inner 

 capillitium, so that when the sporangia are thoroughly desiccated, 

 the net will become collapsed, and the columella displaced lat- 

 erally and twisted, rising in a loose spiral. Specimens that have 

 undergone the change may be found in any herbarium after a long 

 period of drying. Abnormal forms often have a basal structure 

 of wide, irregular and interwoven stalks, which after the capillitia 

 and nets are gone remind one of the genus Amaurochaete. Weak 

 forms vary as the conditions varied when and where they de- 

 veloped. This is seen in many collections, including the two 

 authentic specimens of Morgan, named Comatrichaflaccida. The 

 two are not alike and merely weak forms of S. splendens. The 

 weakness may indicate itself in irregular stalks, but always ex- 

 tends to the capillitium and surface-net, which latter may be 

 absent entirely, and in most cases both will break away with time, 

 leaving only stalks and spores. All such weak forms are var. 

 flaccida. The specimen of Amaurochaete ferruginea Macbr. & 

 Martin, kindly provided by Prof. G. W. Martin as probably from 

 the type material collected in California, is 5'. splendens. It is 

 abnormal and probably var. flaccida. In all these weak forms 

 mentioned the spores are like those of 5. splendens. 



7. Stemonitis uvifera Macbr. N. A. Slime-Moulds ed. 2. 161. 



1922. 



Plasmodium? Sporangia clustered, 7 to 9 mm. high, resem- 

 bling those of 5. splendens in habit and capillitium; the latter has 

 membranous expansions in the axils of many of the branches. 

 Spores purplish gray, 7-9 m, grouped in clusters of four or more, 

 and marked with a cap of minute spines on the side facing out- 

 wards in the cluster. 



Type locality: Washington. 



Habitat: On dead wood. 



Distribution: *District of Columbia, *Pennsylvania, *Mon- 

 tana, *Washington. 



Illustration: Macbr. N. A. Slime-Moulds ed. 2. pi. 20, figs. 



8, 8a-c. 



The description is taken from that of Lister based on the type 

 collected on Mt. Ranier, Washington, in 1914. Quoting Lister 

 further, "A specimen collected by Mr. Hugo Bilgram, near 

 Philadelphia, is similar in having the spores adhering loosely in 

 clusters, but they measure 9-11 m and are equally spinulose all 



