Table 2.
Morphological comparison of East Asian members of the Postia caesia complex. Description of P. simulans is based on East Asian material only.
| Species | Distribution/ host | Upper surface | Pores per mm | Tramal hyphae (measurements include 60 % of variation around median diameter) | Basidiospores (variation of specimen means) | Other | |
|---|---|---|---|---|---|---|---|
| Narrow-spored species (W<1.3 μm) | bifaria | East Asia; cold temperate; conifers | pubescent | 6–8 | thin- to slightly thick-walled, collapsing, 2.5–3.8 μm | L=4.09-4.1 μm, W=1.11-1.16 μm, Q=3.53-3.69 | |
| caesiosimulans | holarctic; temperate; Abies in East Asia, various hosts elsewhere | smooth | 5–7 | slightly to distinctly thick-walled, often densely arranged, 2.9–3.8 μm (walls up to 1 μm) | L=4.47-5.14 μm, W=1.14-1.27 μm, Q=3.79-4.05 | Q mostly <4 | |
| coeruleivirens | East Asia; warm temperate - tropical; deciduous trees | pubescent | 6–8 | thin- to moderately thick-walled, 2.4–3.4 μm (walls up to 0.8 μm) | L=3.69-4.32 μm, W=1-1.16 μm, Q=3.59-3.72 | ||
| glauca | East Asia; cold temperate; conifers | smooth to pubescent | 5–8 | thin- to slightly thick-walled, loosely arranged, 2.6–3.3 μm | L=4.45-4.9 μm, W=1.27-1.28 μm, Q=3.48-3.86 | colored (amyloid) hyphae | |
| magna | East Asia; temperate; deciduous trees | pubescent | 4–5 | slightly thick-walled, 2.2–3.3 μm | L=3.97 μm, W=1.13 μm, Q=3.51 | big basidiomes, thick context, wide context hyphae (4.2–6.0 μm) | |
| populi | holarctic; temperate / boreal; deciduous trees, prefers Populus | smooth | 5–7 | thick-walled, densely arranged, 2.7–3.3 μm (walls regularly >1 μm) | L=4.58-5.07 μm, W=1.12-1.24 μm, Q=3.86-4.37 | undulating cap margin, Q mostly >4 | |
| Wide-spored species (W>1.3 μm) | simulans | holarctic; temperate / boreal; prefers conifers | smooth, brown when old | 5–7 | slightly to distinctly thick-walled, 2.7–3.2 μm (walls 0.2-1 μm thick) | L=5.17-5.65 μm, W=1.34-1.53 μm, Q=3.69-4 | spores often slightly fusiform |
| yanae | Siberia; boreal; Larix and Pinus | smooth, white to ochraceous | 5–7 | thin- to slightly thick-walled, winding, collapsing, 2.2–2.9 μm | L=4.74-5.36 μm, W=1.35-1.45 μm, Q=3.39-3.81 | small basidiomes on branches, dry habitat | |
| Yellow species | auricoma | Eurasia; boreal / temperate; Larix and Pinus | matt to pubescent, sometimes blue | 4–6 | slightly to distinctly thick-walled, loosely arranged, 3.1–4.1 μm | L=5.03-5.05 μm, W=1.62-1.69 μm, Q=2.98-3.12 | deep green when bruised |