Images of P. pileiformis (Berk.) Fr. and P. jugoyasan Hara are given on the left. Information can be found below.
* Dennis, R. W. G. 1957. Further notes on tropical American Xylariaceae. Kew Bull. 1957: 297-332.

This genus has the following characteristics:

stromatal tissue quantity: distributed above, around, and beneath perithecia
stromatal layers: unipartite
stromatal surface level: erumpent or superficial
stromatal interior: essentially homogeneous
stromatal orange granules surrounding perithecia: absent
stromatal KOH pigments: absent
stromatal conidium-bearing discs: absent
stromatal bases: stipitate or, if sessile, conspicuously constricted
stromatal size: less than 1 cm diam
stromatal aggregation: not forming a crust
stromatal shapes: other than wiry
coremial pegs or remnants: absent
subiculum: absent
substrates: associated with dung
ascomatal number per stroma: mostly multiperitheciate
ascomatal ostioles: present
ascomatal configurations: not valsoid
ascomatal orientation: mostly oriented vertically
ascal apical rings: present
ascus height vs width: usually higher than wide
ascospore cell number: one-celled
ascospore shapes: other than cuboid
ascospore color: colored
ascospore ornamentation: smooth
ascospore germination site morphology: slit-like
perispore dehiscence: indehiscent
anamorphs: Linquistia
cultural gross morphology on oatmeal agar: not highly furrowed or distorted
places where teleomorph and anamorph are produced: on the same stromata in most species