Mar. xo, 1923 
Sclerotinia carunculoides 
835 
Dr. Shirai, slightly larger than the spores of our fungus. The spores of 
the latter are reniform, and attached to the concave surface of each spore 
are peculiar bodies (fig._i, A) which are striking structures morphologi¬ 
cally. Viewed under low magnification these bodies resemble a caruncle, 
(fig. 1, B). Under higher magnification they are seen to be composed 
of two parts, one a body adjacent to the spore and more or less rhombic 
in shape as seen from above (fig. i, A, a) and crescent-shaped (fig. i, 
A, b) in transverse section of the spore, the second a body adjoining the 
first and more or less hemispherical (fig. i, A, c). No description of 
similar bodies has been found in the literature on Sclerotinia or on 
closely related genera. The presence of these caruncle-like bodies made 
possible the identification of the ascospores on the pistils. Further 
studies are being made on the nature of these structures. Stained prep¬ 
arations show the spores to be surrounded by a gelatinous-like substance 
which appears to be broken up into segments in the ascus, so that the 
ascus has somewhat the appearance of being marked by transverse 
septa (fig. 1, C). Somewhat similar appearances are shown by Wor- 
onin 5 on Plate io, figures 21 to 23, of his drawings of Sclerotinia megalos - 
pora Wor. and by Boudier 6 on plate 318 of his drawings of Peziza cucul- 
lata Boud. 
As stated above, this fungus differs morphologically from Sclerotinia 
shiraiana , which produces a somewhat similar but distinct disease in 
Japan; it also appears distinct from any other described species. The 
name, Spermatomyces mori , gen. nov., sp. nov., which was suggested by 
Orton ( 1 . c.), 7 referred to the microconidial stage, and since no technical 
description was published, it must be considered a nomen nudum . The 
fungus is described as follows: 
Sclerotinia carunculoides, n.sp. 8 
Apothecia one to several from a single sclerotium, disc cupulate to subcupulate, 4 
to 12 mm. in diameter, inside snuff-brown, 9 outside Prout’s brown; stalk cylindrical, 
flexuous, smooth, attenuated downward, 15 to 42 mm. in length, reaching a diameter 
of 1.5 mm., color Prout’s brown; asci cylindrical to cylindro-clavate, 104 to 123/x by 
6.4 to 8/a, average 117 by 7/a, 8-spored; ascospores uniseriate, reniform, hyaline, 6.4 to 
9.6/4 by 2.4 to 4/i, average 7.6 by 3.1 / 4 , with two bodies on the concave surface: namely, 
a body more or less rhombic in shape as seen from above, 2 by 4 ju, and adjoining it, 
a more or less hemispherical body 3 /4 in its longest diameter; paraphyses filiform to 
cylindro-clavate, simple or branched, septate or nonseptate, 94 to 128 /4 by 1.8 to 2 /a; 
microconidia hyaline, subglobose, 2 to 4 /4 by 2 to 3.2 /4, average 2.8 by 2.5 /a; sclerotia 
black, fairly regular, subspherical with depressed surfaces. 
On fruits of cultivated Morns alba. Type material collected at Scranton, S. C., 
U. S. A., March. 1921. Specimens have been deposited in the Office of Pathological 
Collections, Bureau of Plant Industry, United States Department of Agriculture, 
Washington, D. C. 
6 WORONIN, Michael. UBER die SKLEROTIENKRANKHEIT DER VACCINIEEN-BEEREN. ENTWICKELUNGS 
GESCHichte der DiESE krankheit verursachenden sclErotinien. Mem. Acad. Imp. Sci. St. Petersb. 
• 6 r. 7, t. 36, no. 6 , 49 p., 10 col. pi. St. Petersbourg, 1888. 
8 Boudier, Emile, icones mycologicae ou iconographie des champignons de France principale- 
MENT discomycetes .t. 2, pi. 318 (col.), t. 4, p. 177. Paris. 1905-1910. 
1 Orton, W. A. op. ax. 
8 Sclerotinia carunculoides , sp. nov. 
Ascomatibus ex uno sclerotio solitariis vel pluribus exorientibus, discis cupulatis vel subcupulatis, 
4-12 mm. diam., intus stemutamento-brunneis, extus “ Prout’s "-brunneis; stipitibus cylindraceis, flex- 
uosis, glabris, deorsum attenuatis, 15-42 mm. longis, usque 1.5 mm. diam., “ Prout’s’’-brunneis; ascis, cyl¬ 
indraceis vel cylindro-clavatis, 104-123X6.4-8/*, medio numeroii7X7 m, octosporis; ascosporis uniseriatis, 
reniformibus, hyalinis, 6.4-9.6X2.4-4 /*, medio numero 7.6X3.1 m, faciebus superis duo corpusculis praeditis: 
videlicet corpusculo piano, nonnihil rhombio desuper viso 2X4 /*; et hoc attingente altero corpusculo plus 
minusve hemisphaerico, longissimo diametro 3 n\ paraphysibus filiformibus vel cylindro-clavatis, simpli- 
cibus vel ramosis, septatis vel non-septatis, 94-128X1.8-2 a*; microconidiis hyalinis, subglobosis, 2-4X2-3.2 n, 
medio numero 2.8X2.5 /*; sclerotiis nigris, mediocriter regularibus, sphaeroideis, superficiebus depressis. 
In fructibus cultis Mori albae, Scranton, South Carolina, U. S. A. 
9 Ridgway, Robert, color standards and color nomenclature. IV, 43 p., 53 col. pi. Washing¬ 
ton, D. C. 1912. 
