Holotype. Cuba: Ad Sphaeriam allantodium Berk. (Hist. Nat. Cuba, herb. Montagne: K. presumed holotype!).
Additional Specimens Examined. COLOMBIA. ANTIOQUIA: Ca. 37 km from Dabeiba, on the Dabeiba-Turbo Rd., ca. 800 ft, on Nectria suffulta, Dumont (CO 6502), Carpenter & Sherwood, 15 Aug 1976 (NY). CUNDINAMARCA: Vic. km 15 from Fomeque, rd. between Calera and Fomeque, on Nectria cf. cyatheae Dingley on internodes of Chusquea sp., Dumont (CO 978) et al., 10 Jul 1974 (NY). VENEZUELA. DTO. FEDERALE: Mt. La Naiguata, above La Planta, trail between Rio Chiquito and Rio Grande, on Nectria suffulta on log, Dumont (VE 747), Haines & Manara, 25 Jun 1971 (NY, VEN). BRAZIL. RIO GRANDE DO SUL: Sao Leopoldo, on Hypoxylon, Rick, 1904 (PACA 13997 [1502],
HOLOTYPE of Lisea parasitica). NEW ZEALAND. NORTHLAND: Hokianga County, Mangamuka Bridge, vic. Omahuta Forest Headquarters, on Nectria sp., Samuels, 11 May 1983 (PDD 46285).

Anamorph. None known.
Mycelium not apparent. Perithecia solitary or cespitose in groups of up to 10, superficial, non-stromatic, pyriform, (85-)106-163 µm diam., with a blunt papilla, smooth, collapsing by lateral pinching when dry, pale yellow to nearly colorless, not changing color in 3% KOH; with white, unbranched, septate, hyphal, hairs 10-20 µm long x 3-4 µm wide at base, wall 1 µm thick, forming a more or less obvious fringe around the perithecial apex depending on the collection. Cells at the surface of the perithecial wall forming textura epidermoidea, 5-7 µm wide, walls unevenly thickened, lumina of some adjacent cells joined by fine pores. Perithecial wall ca. 10 µm wide, comprising a single region of elliptical, 5-7 x 2-3 µm cells with thin walls; perithecial apex formed by a compact palisade of hyphal elements, each with a rounded tip and many growing outwardly to form the hairs, becoming progressively narrower and more thin-walled toward the ostiolar canal and merging there with the periphyses. Asci clavate, 25-34(-40) x 4-6(-7) µm, apex simple (type collection) or with a minute ring; 8-spored, ascospores biseriate, completely filling each ascus. Ascospores ellipsoidal to oblong, (5-)5.7-7.3(-9) x 2-2.5(-3) µm, equally 2-celled, constricted or not at the septum, smooth or finely spinulose, colorless (type collection) or pale brown.

Known Distribution. Brazil, Colombia, Cuba, New Zealand, Venezuela.

Habitat. On perithecia of Hypoxylon, Nectria, and Xylaria.

Notes. The various specimens assigned herein to N. perpusilla differ subtly from the type collection of the species. The basic concept of N. perpusilla is of a species with small yellow perithecia seated directly on the perithecium of the host ascomycete and with no obvious mycelium; with short and often inconspicuous hyphal hairs that grow outwardly from the perithecial papilla (although none were noted on perithecia of the type collections of N. perpusilla or Lisea parasitica); ascospores that are among the smallest found in the entire genus [(6-)6.5-7.5(-8) x 2-2.8(-3) µm in the type collection of N. perpusilla] and that are smooth and colorless. Ascospores of CO 978 are pale brown, and ascospores of VE 747 are finely spinulose.
Although the type specimens of fungi described by Montagne are usually found in PC, I was not able to locate any material of Hypocrea perpusilla there. The label on the specimen found in K indicates that this collection is at least a part of the original gathering.