Scutellinia key
Key adapted from an unpublished document by Yi-Jian Yao (Kew) | ||
1 | Fully developed ascospores globose to subglobose (ratio of length to breadth 1.0 - 1.2); ornamentation on ascospore surface very conspicuous | 2 |
Fully developed ascospores broadly ellipsoidal to ellipsoidal (ratio of length to breadth greater than 1.2); ornamentation on ascospore surface conspicuous or not | 6 | |
2 | Spore ornamentation comprising ± cylindrical or conical, truncate or pointed projections, often higher than 2 µm; ascospores less than 20 µm diam. | 3 |
Spore ornamentation comprising mainly hemispherical warts, mostly lower than 2 µm high, or if higher than 2 µm then ascospores greater than 20 µm diam. | 4 | |
3 | Spore ornamentation of conical projections, pointed at the apex; marginal hairs of apothecium with 3 - 5 septa; ascospores 15.5-18 µm diam. | S. legaliae |
Spore ornamentation comprising truncate, rarely pointed, almost cylindric or tapering projections; marginal hairs of apothecium commonly with many septa; ascospores 14-17 µm diam. | S. trechispora | |
4 | Ascospores (23-) 24-30.5 (-33) x (22-) 23.5-30.5 (-33) µm; spore ornamentation of large warts, commonly 2-3 (-4) µm high and 2-4 µm broad, interspersed with small punctae | S. citrina |
Ascospores usually less than 23 µm diam., never greater than 25 µm diam.; spore ornamentation lower than 2 µm high | 5 | |
5 | Ascospores globose, 17.5-22 (-24.5) µm diam.; spore ornamentation varying in size, warts (0.5-) 1-1.5 (-3) µm across, (0.5 -) 0.8-1.2 (-1.8) µm high, frequently unevenly distributed; asci 20-32 µm diam. | S. barlae |
Ascospores globose to subglobose, 15.5-18.0 x 15.0-18.0 µm; warts (0.5-) 0.8-1.5 (-2) µm across, (0.5-) 0.8-1.5 (-1.8) µm high, usually evenly distributed; asci 18-22 µm diam. | S. minor (cf. also S. patagonica) | |
6 | Fully developed ascospores 18-21 x 10-12 µm, smooth (at least as observed under the light microscope, x 100 oil lens); apothecia small, 0.5-1.5 (-2.5) mm diam. | S. setosa |
Fully developed ascospores ornamented (ornamentation discernible under the light microscope, x 100 oil lens); apothecia usually larger than 1.5 mm diam. | 7 | |
7 | Spore ornamentation appearing as a complete or incomplete network in surface plan view | 8 |
Spore ornamentation consisting of isolated warts or of short, sometimes irregular or interconnected ridges | 9 | |
8 | Spore ornamentation of large warts, (0.8-) 1.5-2 (-3) µm across and (1.5 -) 2 (-2.5) µm high, with narrow interconnections; ascospores broadly ellipsoidal or occasionally subglobose, 20-22.5 (-24) x 14-18 µ | S. decipiens |
Spore ornamentation reticulate in plan view, 0.5-1 µm across and 2.5-4 µm high, sometimes appearing as acuminate spines on spore outline; ascospores ellipsoidal, 17.5- 20 x 11.5-13 µm | S. pseudotrechispora | |
9 | Marginal hairs mostly dark, but sometimes almost colourless except near the base, short, mostly 150-200 µm long; spore ornamentation of small, isolated warts, 0.5-1 µm across and less than 0.5 µm high, sometimes mixed with short ridges; ascospores mostly broadly ellipsoidal, 20-25 x 14.5-20 µm | S. kerguelensis |
Marginal hairs uniformly dark yellow-brown or if pale then longer than 200 µm and/or spore ornamentation higher than 0.5 µm; spore ornamentation of isolated warts or of short interconnected ridges; ascospore shape various | 10 | |
10 | Spore ornamentation appearing as short, interconnecting ridges | 11 |
Spore ornamentation of predominantly isolated warts | 15 | |
11 | Spores with an outer layer (including the ornamentation) that loosens when heated in lactic acid/cotton blue | 12 |
Spores without a separable outer layer | 14 | |
12 | Ascospores 23-28 x 11-14 µm; spore ornamentation 0.5-0.8 µm high on spore outline | S. mirabilis |
Ascospores less than 25 µm long, ellipsoidal to broadly ellipsoidal | 13 | |
13 | Ascospores 19-24 x 11-15 µm; marginal hairs 150-400 µm long, often ± hyaline and curved in the upper part | S. superba |
Ascospores 15.5-19 x 8-11.5 µm; marginal hairs brown and flexuous throughout | S. torrentis | |
14 | Ascospores 17.5–22 (-23) µm long [to 13 µm wide]; marginal hairs often longer than 1000 µm, sometimes 1500-2000 µm long | S. scutellata |
Ascospores 21.5-28 µm long, mostly longer than 22 µm; marginal hairs usually shorter than 1000 µm | S. olivascens | |
15 | Spore ornamentation higher than 0.5 µm, distinctly visible on spore outline (under x 40 objective of the light microscope), often broader than 0.8 µm, reaching 2.5 (-4) µm across | 16 |
Spore ornamentation usually lower than 0.5 µm, indistinct on spore outline, mostly less than 0.8 µm across | 18 | |
16 | Ascospores ellipsoidal to broadly ellipsoidal, occasionally subglobose (ratio of length to breadth 1.2 - 1.6), (17.5 -) 18-22.5 (-24) x 13-17 µm | S. umbrorum |
Ascospores ellipsoidal or elongate-ellipsoidal (ratio of length to breadth 1.6 - 2.3), (21.5 -) 22.5-27.5 (- 31.5) x (10-) 11-13 (- 15.5) µm | 17 | |
17 | Marginal hairs 18.0-25.0 µm diam.; ascospores equilateral, 25-27.5 x 12- 13 µm; spore ornamentation of conspicuous warts 0.8-1.2 (- 2) µm diam., occasionally confluent | S. macrospora |
Marginal hairs 20-50 µm diam.; ascospores frequently inequilateral, (21.5-) 22.5-26.5 x (10-) 11-13 (- 15.5) µm; spore ornamentation of warts varying in size, (0.3-) 0.5-1.5 (-2) µm across | S. cejpii | |
18 | Ascospores ellipsoidal (ratio of length to breadth 1.3 - 1.8), (19.0-) 20-23 (-24) x (12-) 13-15 (-16) µm; marginal hairs usually uniformly coloured; colourless and thin-walled hairs often also present | S. subhirtella |
Ascospores broadly ellipsoidal to ellipsoidal (ratio of length to breadth 1.2 - 1.3), 18.5-21 (-23.5) x 14.5-18 (-21) µm; marginal hairs pale at apex; colourless hairs absent | S. patagonica |
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