1885.] 



NORTH AMERICAN GLCEOSFORIA. 



117 



divided in the middle, arising from the pointed apices of the cells form- 

 ing the proligerous layer and oozing out in an amber-colored mass. In 

 old specimens, emptied of spores, the places of the acervuli are marked 

 bj^ little cup-shaped cavities. All the characters of this fungus point to 

 GloEosporium, and we place it there without hesitation. 

 On Castanea vesca, Xewfield, N.J. 



If we accept Marsonia as a genus distinct from Glceosporium, then 

 this production must, in different stages of its growth, belong to two dis- 

 tinct genera. In our opinion, it is much better to regard Marsonia and 

 Septogloeum as mere sections of Glceosporium ; or, if they are to be 

 regarded as distinct, they should in a systematic arrangement, stand con- 

 secutively, and not be separated by intervening genera. 



C. Spores 2-or-more septate (SeptogZcpi/;??!, Sacc.) 



42. GL(EOSPoriiU3i ANaELic^, Cke., Grev. YII, p. 34. 



Spots fuscous, various. Acervuli gregarious, round, scarcely prom- 

 inent. Spores cylindric-clavate, nucleate, at length biseptate, hyaline, 

 40—60 X 8 IK 



On fading leaves of Archangelica, South Carolina (Ravenel). 



43. Gl(E0SP0riu3I ^^Tuttallii, Hark. 1. c. 



Spots epiphyllous, reddish-brown, 2—5 mm. in diameter, suborbicular 

 and rather indefinitely limited. Acervuli, gregarious, often circinate, 

 more distinctly visible on the lower face of the leaf, but discharging the 

 spores in flesh-colored masses, more abundantly above. Spores cylin- 

 drical or clavate cylindrical, subhyaline, 1 — 5-septate, mostly 1-septate, 

 with a row of nuclei, broader and more obtuse at the apex, 45—75 x 3— 4i 

 .'J- (36—45 x 4—5 Hark.) 



On leaves of Nuttallia cerasiformis, California (Ilarkness.) 



44. Glceosporium Fraxini, Hark. 1. c. 



Spots epiphyllous, minute, whitish, light rusty-brown when dry, 

 angular and irregular, 4 — 10 mm. diameter. Acervuli epiphyllous. 

 Spores cylindrical, mostly irregularly bent or curved, 2 — 5-septate, 20—40 

 X 3—3* !■>-, mostly 25—35 x 3 fJ- (16—24 x 4—5 fJ- Hark.) issuingin pale, flesh- 

 colored masses. The spots are scarcely visible below but are very abun- 

 dant above, giving the leaf a mottled appearance. 



On living leaves of Fraxinus Oregana, California (Harkness.) 



45. GLCE0SP0RIU3I MACULANS, Hark., 1. c. 



Spots epiphyllous, circular, dark, 1 — H cm., or often occupying one- 

 half or more of the leaf, rather indefinitely limited, radiate, fibrous. 

 Acervuli hypophyllous, small, gregarious or scattered. Spores oblong- 

 fusoid or subcyliudrical with one end pointed and curved and the other 

 rounded-obtuse, endochrome, 1—5 times divided, 30—50 x 6—9 p-. The 

 leaves are also discolored on the lower surface. The radiate-fibrous 

 structure on the upper surface of the leaf is peculiar. 



On leaves of Salixlasiolepis, California (Harkness.) 



We have seen no specimens of Septoglceum salicinum, Pk., which may 

 not be sufliciently distinct from this. 



