While marching to where I thought might be a likely spot to find Black Trumpets (no, I didn't find any, because they are 
invisible), I found many fascinating and beautiful little slime molds.  These are all quite small (in the grand scheme of things)--the 
Hemitrichia 
clavata is little 2mm balls on a stalk. The Chocolate Tube slime is 
about 1/2" tall.
|  | 
| Hemitrichia 
clavata | 
|  | 
| OZONIUM of Coprinellus domesticus | 
|  | 
| "Carnival Candy Slime," Arcyria denudata | 
|  | 
| "Chocolate Tube Slime," Stemonitis splendens | 
                                                                
|  | 
| a bunch of Chocolate Tube Slime on a log | 
                                     
More on "ozonium" 
here. Couldn't find much more about it after a cursory online search.