Status Anamorphicus: Acremonium/ Verticillium,
conidia eseptata, (4.5-)5.6-8.9(-10.8) x (1.8-)
2.4-3.4(-3.6) ixm, conidiophorae pauciramosae.
Hab.: In cortex.
Holotypus: French Guiana (Samuels 5978, N Y )
Characteristics in Culture. Colonies grown 10
days at 20°C, diffuse daylight, on commeal dextrose
agar (Difco) 2 cm diam., flat, white, transparent,
with aerial mycelium scant or lacking.
Conidiophores mononematous or held in pionnotes,
70-100 µm long, straight, smooth, colorless,
unbranched and monophialidic or verticillately
branched, each branch bearing a single
phialide. Phialides 20-55 µm long, 1.8-2 µm at
base, 1.5-1.8 µm at tip, collarette slightly thickened,
flared or not. Conidia oblong, (4.5-)5.6-
8.9(-10.8) X (1.8-)2.4-3.4(-3.6) µm, aseptate,
with or without a slightly protuberant basal abscission
scar, colorless, held in colorless slime
Habitat. Bark of dicotyledonous trees.
Etymology of the Specific Epithet. Gossypinus
refers to the white hyphae that enclose the perithecial
TYPE. FRENCH GUIANA. Upper Marouini River,
2 k m N of Oumanfou-Langasoula, 02º24' N,
54º00'W, elev. 150 m, on bark of recently dead tree,
23,24 Aug 1987, Samuels (5978), deGramille, AUorge,
Hahn, Hoff & Weitzman (holotype N Y , isotype CAY).
Paratypes. VENEZUELA. Amazonas: Dpto. Rio
Negro, Cerro de la Neblina, along Rio Mawarinuma,
just outside Cafion Grande, vie. Neblina Base Camp,
00°50'N, 66nO'W, elev. ca. 140 m, on bark, Samuels
7772 (NY, VEN).
GUYANA. Cuyuni-Mazaruni Region, VII: Mazaruni
Subregion, VII-2, foothills immediately S of Mt.
Ayanganna, ca. 1 k m W of Pong River, 05°28'N,
60º04'W, elev. 550-650 m, on bark of recently dead
tree, Samuels (4830), Pipoly, Gharbarran, Chin & Edwards
Notes. Nectria gossypina superficially resembles
N. subfalcata Henn., but the two are easily
distinguished through perithecial anatomy and
ascospore morphology. There are no obvious relatives
for N. gossypina in Nectria; the rather wide
perithecial waU formed of circular to angular ceUs,
the oblong, obtuse ascospores, and the Acremonium
anamorph recall the N. peziza (Tode:
Fr.) Fr.-Group (Samuels, 1976), but perithecia
of species of that group do not become yellow in
lactic acid and the Acremonium anamorph has
unbranched conidiophores. Nectria gossypina is unusual for its stroma, which is formed of loosely intertwined hyphae that emerge through the bark.
The anamorph of this species is morphologically
intermediate between Acremonium and
Verticillium. A n anamorph simUar to that formed
in culture was found on the holotype specimen