Summary:
Monilinia laxa produces a grayish brown cup or disc with a stem, growing gregariously on mummified plums, but the fruitbody is rare in nature. The conidial stage is more common, forming soft grayish pustules on flowers, branchlets and young plums. The Hansen, L.(1) description is for M. laxa (Aderh. & Ruhl) Honey.
Monilinia laxa is found in WI and on the Pacific Coast, and is also reported from Europe (including Denmark, Norway, Sweden, Finland), and Japan. There are collections from BC at the Pacific Forestry Centre.
Upper surface:
reaching 0.4-0.9cm broad, at first club-shaped, expanding and becoming cup-shaped, finally nearly flat with umbilicate center; gray or almost white, (Seaver), 0.3-0.8cm broad; grayish brown; conidial stage of soft grayish pustules, (Hansen)
Stem:
with a stem 1-3cm x 0.1-0.2cm, (Hansen)
Microscopic:
spores about 12 x 6 microns in diameter, elliptic, uniseriate, or becoming partly biseriate; asci 8-spored, reaching length of about 175-180 microns and a diameter of 8-9 microns, cylindric, narrowed in lower part; conidia 12-23 x 9-15 microns; paraphyses 2-2.5 microns wide, slender, slightly enlarged in upper part, (Seaver), spores 7-19 x 4.5-8.5 microns, elliptic, with rounded ends; asci 120-190 x 7.5-12 microns; conidia 8-23 x 7-16 microns, oval to lemon-shaped, macroconidia "not separated by disjunctors", (Hansen)
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