LIAS light – Item Descriptions
LIASlight ItemID: 13552
Placopsis antarctica D. J. Galloway, R. I. L. Sm. & Quilhot
| Characters[*]: | Character States[*]: |
|---|---|
| global occurrence: | Antarctic – Antarctica | Antarctic – Southern Subpolar Islands, Subantarctic Islands |
| substrate: | rock, stones, pebbles – unspecified |
| life habit: | lichenized (mutualistic with algal photobionts) |
| thallus: | crustose (crustaceous) – episubstratal – unspecified | placodioid-crustose, placodioid-foliose |
| thallus: | compartimentized – areolate, squamulate |
| [th] upper surface: | grey(ish) | grey(ish) white | yellow(ish) white (ivory, off-white, cream-coloured) | red(dish) white (pink) |
| [th upper surface]: | epruinose | pruinose |
| [th marginal and upper surface] specific structures: | absent | present |
| [th margin] cilia, cilioid structures: | absent |
| [th upper surface] isidia, isidioid structures: | absent |
| [th upper surface] soredia, soralia, soralioid structures: | present |
| [th] morphol substructures (eg areoles, lobes, branches) width [mm]: | (low) 1.0 (high) 1.5 (max) 3.0 |
| [th] morphol substructures (eg areoles, lobes, branches) upper surface: | smooth, plane |
| ascomata: | absent | present |
| ascoma: | apothecial, apothecioid – hymenial |
| ascoma [mm]: | (min) 0.2 (low) 0.5 (high) 1.5 (max) 3.2 |
| ascoma: | sessile, superficial |
| [ascm, if apoth] disc, mazaedium: | plane, flat, flattened, expanded | subconcave, slightly concave |
| [ascm, if apoth] disc, mazaedium: | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | red(dish) brown (if pale: orange brown) |
| [ascm, if apoth] disc, mazaedium: | epruinose |
| [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: | hyaline, colourless |
| [ascm] paraphyses/-oids: | present |
| [ascm] epihymenium, epithecium: | yellow(ish) brown |
| asci: | lecanoralean |
| [asc] tholus: | thickened |
| [asc] tholus amyloidity (iodine reaction): | absent |
| ascospores: | (median) 8.0 |
| [asp] shape: | broadly ellipsoidal | ovoid, ovate |
| [asp] length [µm]: | (low) 16.5 (high) 20.0 (max) 22.0 |
| [asp] width [µm]: | (low) 5.0 (high) 6.5 (max) 8.0 |
| [asp] septa: | absent – spore lumen unilocular, monolocular |
| [asp] pigmentation: | hyaline, colourless |
| [asp] perispore, epispore: | not apparent |
| secondary metabolites: | present |
| secondary metabolites: | gyrophoric acid | lecanoric acid |
| primary photobiont: | present |
| secondary photobionts (eg in cephalodia): | present |
| primary photobiont: | chlorophytaceous – trebouxiaceous, chlorococcoid |