| A. Capillitial threads transverse to the sporangial cavity, attached usually at each end, plain or only slightly roughened | Dianemaceae |
| B. Capillitium plain, papillose, or spinulose, often scanty, not netted, the threads sometimes attached by one end to the sporangium wall | Perichaenaceae |
| C. Capillitium a distinct net, usually attached below to the sporangial wall; sculpture various, not continuous spiral bands | Arcyriaceae |
| D. Capillitial threads transverse, fascicled, attached at both ends, but sculptured by well defined spiral bands | Prototrichiaceae |
| E. Capillitial threads typically free, sometimes more or less branched, forming a loose net attached below, characterized by definite spiral bands, or sometimes by scattered rings | Trichiaceae |
A. DIANEMACEÆ
Key to the Genera of the Dianemaceæ
| A. Capillitial threads attached at one end, or free | 1. Margarita |
| B. Capillitial threads attached at each end | 2. Dianema |
1. Margarita List.
- 1894. Margarita Lister, Mycet., p. 203.
Sporangia sessile, the capillitium simple, hair-like, coiled.
1. Margarita metallica (Berk. & Br.) List.
[Plate XVII]., Figs. 1, 1 a, 1 b.
- 1838. Physarum metallicum Berk. & Br., Mag. Zool. & Bot., I., p. 49.