Diderma species

Moreira, Izabel Cristina, Leonardo-Silva, Lucas & Xavier-Santos, Solange, 2025, Diderma laiseae (Didymiaceae, Physarales), a new species of Myxomycetes from Brazil, Phytotaxa 682 (2), pp. 192-196 : 193-194

Key to Diderma species occurring in Brazil

- Stalked ................................................................................................................................................................................................1 - Sessile.................................................................................................................................................................................................2

1 Peridium single...................................................................................................................................................................................3

- Peridium double or triple....................................................................................................................................................................4

2 Columella absent ................................................................................................................................................................................6

- Columella present...............................................................................................................................................................................7

3 Sporotheca subglobose to hemispherical, spores 7.5–12 µm ................................................................................. Diderma rugosum

- Sporotheca globose to oval, spores 14–16 µm ............................................................................................................. D. corrugatum

4 Peridium double, discoid sporotheca, spores 7–9 µm .......................................................................................... D. hemisphaericum

- Peridium triple....................................................................................................................................................................................5

5 Sporotheca discoid, spores 10–13 µm ..................................................................................................................... D. albo-columella

- Sporotheca globose to oval, spores 14–16 µm ................................................................................................................. D. stelullum

6 Sporotheca effused, spores 9–11 µm ...................................................................................................................... D. aglomerospora

- Sporotheca depressed to oblong .........................................................................................................................................................8

7 Sporotheca globose to subglobose......................................................................................................................................................9

- Sporotheca effused to irregular (polygonal).....................................................................................................................................10

8 Spores 6–9 µm................................................................................................................................................................ D. saundersii

- Spores 8–12 µm............................................................................................................................................................ D. deplanatum

9 Spores 7–13 µm................................................................................................................................................................................11

- Spores 13–16 µm........................................................................................................................................................... D. cingulatum 10 Spores dark brown............................................................................................................................................................................13

- Spores pale brown ............................................................................................................................................................................14

11 Spores 7–9.5 µm.............................................................................................................................................................. D. testaceum

- Spores 9–13 µm................................................................................................................................................................................12

12 Spores in mass dark brown, with verrucose and ring ridge, 10–13 µm ....................................................................... D. cor-rubrum

- Spores in mass black, warted, 9–12 µm .......................................................................................................................... D. globosum

13 Spores minutely warted, 7–10 µm...................................................................................................................................... D. effusum

- Spores strongly warted, 9.3–13.3 µm.................................................................................................................................. D. laiseae

14 Spores pale brown to brown, minutely spinulose, 10–13 µm ................................................................................ D. chondrioderma

- Spores light yellow brown, with dispersed spinules, 8–11 µm ................................................................................. D. spumarioides