The original description is in German. This is what I got by copy/pasting it into google translate with a couple edits because the text was converted from PDF:
Peroneutypa portoricensis n. spec.
Stromata streaked or stretched wart-shaped, usually quite strongly protruding, forming more or less parallel pustules in the longitudinal direction of the substrate, often closely packed together and more or less spread out, differently furrowed, humped and fissured, rough, black crusts flowing together, the surface of the wood blackening to a large extent, of brittle, charcoal quality, ingrown, the uppermost fiber layers of the wood, which are dark. discolored brown and richly interspersed with indistinctly fibrous small cell tissue. Perithecia more or less crowded, usually arranged in rows, the Stroma completely sunk, more or less spherical, often flattened by mutual pressure, angular and then mostly very irregular. about 400 um in diameter, with very much elongated, protruding, bristle-shaped, upright or inclined, straight or different, mostly wavy curved, rigid, cylindrical, bluntly rounded, pierced black, approx. 4-6 mm long, 80-100 u thick mouths. ca. 4-6 mm long, 80-100 um thick mouths. Perithecium membrane about 20-25 um thick, of fibrous, indistinctly timely, almost opaque black-brown outside, only slightly lighter colored inside. Asci narrow today, bluntly rounded at the top, gradually tapering into a more or less long stem below, 8 spore, p. sp. 20-26 × 4-5 um. Spores clenched or indistinctly 2 rows, cylindrical, fairly strongly allantoid curved, bluntly rounded on both ends, often with 2 small, more or less polefinded oil droplets, pale yellow, bland byzlin, brownish in large quantities, 1-celled, 5-6 × 1.5-1.75 um. Psoudoparephyses quite numerous, thready, tender, almost completely mucilaginous.
On barked wood. – Porto Rico; Forest near Mayagüez, 17. XII. 1915, leg. B. Fink no. 930.
This mushroom matches quite well with a form growing on bark, also collected in Porto Rico, which grows in the company of a Harpographium and is probably identical to Scoptria heteracantha. The only difference is the thinner, heavily meandering, even longer mouths and the strongly developed, typically eutypoid current. Since these characteristics are quite variable in Eutypa and related genera, the possibility must be given that P. portoricensis was only a different substrate form of the mentioned genus.