The greenish-gray
thallus of
Punctelia subpraesignis is in diameter. It comprises irregularly branched, overlapping lobes that are wide. The texture of the thallus surface ranges from smooth to wrinkled. Vegetative
propagules such as lacinulae, maculae, pustulae,
soredia, and
isidia are absent in this species.
Pseudocyphellae are abundant; they are point-like (
punctate), typically rounded or
ellipsoid, and occur throughout the thallus surface, margins, on protrusions, and on the amphithecia (the thalline margins of an
apothecium). The
medulla is white, sometimes with a
rose tinge. The thallus undersurface is smooth and black with a pale brown to dark brown margin.
Rhizines are brown to black, unbranched or irregularly branched. The urn-shaped (
urceolate) to concave apothecia measure in diameter and have a brown disc without perforations.
Ascospores are roughly spherical to ellipsoid, with dimensions of 11.0–15.0 by 7.5–12.0
μm.
Conidia (asexual spores) are hook-like (
unciform) and measure 4–7 by about 1 μm. The standard
lichen spot test results are
K+ (yellow), and
UV− in the
cortex, indicating the presence of
atranorin; in the medulla they are K−, KC+ (rose or red),
C+ (rose or red),
P−, and UV−, indicating the presence of
gyrophoric acid. ==Habitat and distribution==