CYLINDROSPORIUM ON STONE FRUITS 
Status conidicus: maculis sparsis vel confluentibus, minutis, brunneis aut 
rufis-brunneis, interdum majusculis dejectis, acervulis solitariis amphigenis, sub- 
epidermicis, disciformibus; conidiis filiformibus, flexuosis, denique emergenti-super- 
ficialibus, hyalinis 45-65 X 2.5-4/x, simplicibus aut 1-2 septatis; conidiis minoribus 
autumno, hyalinis, continuis 4-5 X i.5m- 
Hab. In foliis vivis Prunii, P. cerasi, et P. pennsylvanicae. 
Coccomyces prunophorae n. sp. Ascocarps hypophyllous, usually aggregated, 
subepidermal, erumpent, disk-shaped to subglobose, 125-250 X ioo-i6o/i, black, 
at first closed but at maturity opening in a stellate manner; hymenium light gray; 
asci clavate to clyindrical-clavate, 63-87 X 9-12^1, opening by a pore at the papillate 
tip; spores slender, straight, curved near the end, 40-60 X 2.5-3.5/1, at maturity 
almost filling the asci, continuous or 1-3 septate; paraphyses simple or branched, 
enlarged at apex, septate, about as long as asci; apothecial conidia produced on 
short conidiophores inside the apothecia, following the asci, usually once septate, 
40-60 X 2.5-3.5^1, resembling ascospores but usually stouter. 
Conidial stage {Cylindrosporium prunophorae): mycelium intercellular with 
haustoria which enter host cells; spots small, brown or reddish brown, sometimes 
dropping out, producing "shot holes." Acervuli subepidermal, amphigenous, 
finally breaking through exposing the white mass of spores, conidia elongate, slender, 
straight or curved, 46-65 X 3-5-5M, usually i -septate; microconidia (spermatia?) 
found in same acervuli in late summer, small, continuous 4-5 X i.5ai. 
Conidial stage parasitic in leaves of plums (P. domestica, P. insititia, P. americana^ 
and probably P. spinosa). Ascigerous stage saprophytic on fallen leaves of the same 
hosts, May to June, following the conidial stage of the previous summer. 
Latin diagnosis: Ascomatibus hypophyllis, aggregatis vel sparsis, subepidermicis, 
erumpentibus, disciformibus vel subglobosis, 125-250 X ioo-i6oai, nigris, primum 
clausis deinde in lacinias plures acutas dehiscentibus; disco pallido griseo; ascis 
clavatis vel cylindraceoclavatis, fere sporidiis completis, 63-87 X 9-12^1, octosporis, 
apice papillato; paraphysibus filiformibus, simplicibus aut ramosis, septatis; sporidiis 
fasciculatis, linearibus 40-60 X 2.5-3.5/i aut 1-3 septatis; paraphysibus simplicibus 
aut continuis ramosis; sporidiis in apotheciis linearibus rectis vel flexuosis, 40-60 X 
2.5-3-5M, I septatis. 
Hab. in dejectis foliis Prunii domesticae, et P. instititiae. 
Status conidicus; maculis sparsis, vel confluentibus, brunneis aut rufis-brunneis 
interdum majusculis dejectis; acervulis solitariis, amphigenis, subepidermicis, 
disciformibus, conidiis filiformibus, rectis vel flexuosis, denique emergenti-super- 
ficialibus, hyalinis, 46-65 X 3-5-5m, i septatis, conidiis minoribus autumno hyalinis 
continuis, 4-5 X i.5m- 
Hab. In foliis vivis Prunii domesticae, P. insititiae, P. spinosae, et P. amer- 
icanae. 
Coccomyces lutescens n. sp. Ascocarps hypophyllous, subepidermal, erumpent, 
disk-shaped to flattened elliptical, 130-300 X 70-1 50/x, often depressed above before 
maturity, lutescent or dull orange in color, at first closed, then opening in an ir- 
^ Since infection and the Cylindrosporium acervulus can be produced on P. 
americana by the fungus from P. insititia, it is very likely that the perfect stage 
also develops on this species. 
