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NOTES AND OBSERVATIONS. 159 
6. A NEW DISEASE OF CULTIVATED PALMS. 
BY WILLIAM TRELEASE. 
In October, 1897, Mr. W. J. Hesser, a large importer 
and grower of palms, sent to the Garden leaves of Kentia 
and Phoenix affected by unrecognized fungi. The latter 
were referred to Professor P. A. Saccardo, who reports 
that the one on young specimens of Kentia is Gloeo- 
sportum Allescheri, Bres., which, however, may be consid- 
ered a palmicolous form of G. sphaerelloides, Sacc. 
Concerning the fungus on Phoenix (P. canariensis, P. 
tenuis and P. reclinata, but chiefly the first named), Pro- 
fessor Saccardo says: ‘‘This is very interesting, and new, 
and I add a description of it:— 
EXOSPORIUM PALMIVORUM. Sacc. n. sp.— Maculis amphigenis 
minutis suborbicularibus, 1-3 mm. diam., brunneis, interdum in area 
lata expellente foliorum sparsis; sporodochiis superficialibus in areolis 
brunneis dense gregariis, punctiformibus, nigris; basidiis oblongis, con- 
tinuis, olivaceo rufis, 14-165-6 “, in pulvinulum convexum 60-80 / lat., 
80 # altum dense constipatis, monosporis; conidiis e basidio radiantibus 
fusoideis, rectis v. curvis, 80-90>8-9 /, sursum obtuse tenuato-acutatis, 
basi obtusis, 8-10-septatis, non constrictis, olivaceo-fuscis, utrinque 
pallidioribus, conspicue, maxime prima aetate, verruculosis.— Hab. in 
foliis, qua valde vexantur et demum moriantur, palmarum ( Phoenicis etc.), 
in calidariis, Plattsmouth, Nebr., Sept., 1897, comm. Prof. W. Trelease. 
Mycelium circumcirca et infra sporodochia serpit et constat ex 
hyphis filiformibus, ramosis, septatis, olivaceis, 3“, cr., hinc inde denti- 
culatis. Conidia juvenilia sunt breviora, sursum obtuse clavata nec 
acutata, 60-659 4, magis aspera septisque minus manifestis.— Cum 
speciebus Cercosporae, Heterosporti, Closterosporii comparavi, sed longe ~ 
differt et propius ad Hxosporii typum accedit.”” 
TINIE he 
eva Pap 
pus ey 
SIBIR AD 
Ton 
ea 2 
Bate 
tine? 
Cah bt ne 
eae! 
EXOSPORIUM PALMIVORUM. 
Explanation of figures.—1, Spots, natural size; 2, dried sporochia, 
enlarged; 8, sporochium; 4, basidia; 5, spores of various ages; 6, 
mycelium,— all greatly enlarged. 
