Lachnellula key

Key compiled by Brian Spooner (RBG Kew)

1

Ascospores elongated, needle-like, 70 – 95 x 1.5 – 2 μm; saprotrophic on Pinus

pseudofarinacea

Ascospores ellipsoidal, fusiform or globose to subglobose, less than 26 μm long; on various conifers, saprotrophic or parasitic

2

2

Ascospores larger than 12 x 6 μm; saprobic or parasitic

3

Ascospores smaller than 10 x 5 μm; saprobic

6

3

Ascospores fusiform, 4 – 4.5 μm wide, 0- to 1- (to 2-) septate, hairs 100 – 200 μm long; saprotrophic on Abies, occasionally on Picea, Pinus

abietis

Ascospores usually ellipsoidal, broader than 6 μm; on Larix

4

4

Ascospores 12- 16 x 6.5 – 7.5 μm, aseptate

laricis

Ascospores 16 – 26 x 7.5 – 10.5 μm, 0- (to 1-) septate

5

5

Saprobic; ascospores 16 – 24 x 7.5 – 8.5 μm, 0- (to 1-) septate; some paraphyses clavate or moniliform

occidentalis

Parasitic, causing cankers; ascospores 20 – 26 x 9 – 10.5 μm, aseptate; paraphyses not swollen

willkommii

6

Ascospores broadly ellipsoidal to subglobose, 2.5 – 4.5 μm long

7

Ascospores ellipsoidal, longer than 5 μm

8

7

Ascospores broadly ellipsoidal, 3 – 4.5 x 2 – 2.5 μm; on Picea, Pinus

resinaria

Ascospores globose to subglobose, 2.5 – 3.5 x 2 – 3 μm; on Pinus

resinaria var. calycina

8

Ascospores biguttulate, 5 – 6.5 x 2.5 – 3 μm

calyciformis

Ascospores without guttules, 6 – 10 x 2 – 2.5 μm

subtilissima