| Associated with the spores in the sporangium occurs the capillitium. |
| Resembles the first species somewhat in habit, size, and the spinescent capillitium, but the resemblance is superficial only. |
| Capillitium of slender, colorless threads, radiating from the columella, branching and often anastomosing. |
| There is no trace of a capillitium, unless a few occasional threads in the wall of Tubulina prefigure such a structure. |
| Capillitium of slender, flexuous brown threads forming a dense network of rather small meshes. |
| This common species is well marked both by its color and by the delicate attachment of the capillitium to the calyculus. |
