Podoserpula pusio shows a notable degree of morphological plasticity, and fruitbodies can differ markedly in stature, colour, and tier formation depending on local environmental conditions. These differences are best interpreted as environmentally driven variants rather than taxonomic entities.

Nutrient availability
Fruitbodies developing on well‑rotted, nutrient‑rich wood typically form the familiar pale, symmetrical, pagoda‑like tiers. These collections are often taller, with evenly spaced shelves and minimal pigmentation. On nutrient‑poor or less‑decayed substrates, fruitbodies may be shorter, darker, and more irregular, with tiers that appear compressed, contorted, or partially collapsed.

Moisture regime
Stable moisture supports the development of flat, well‑defined tiers, while fluctuating or drying conditions can produce warped, curled, or leathery fruitbodies. Darker pigmentation is also more common in specimens exposed to intermittent drying.

Substrate structure
The angle, hardness, and decay stage of the wood influence the height of the stipe, the regularity of tier spacing, and the overall symmetry of the fruitbody. Specimens growing from harder or uneven substrates often show more irregular architecture.

Interpretation
These forms represent a continuum of environmental responses rather than discrete taxa. The pale, tiered “pagoda” morphology and the darker, compact “tristis‑like” form occur within the same species and can appear at the same site under different substrate and moisture conditions.