PSYCHE, 



AMERICAN PHYTOPTOCECIDII. 



BY H. GARMAN, LEXINGTON, KY. 



i . On the leaves of Nyssa multiflora. 

 A nodular growth of the leaf substance, 

 forming small, rounded prominences on 

 both upper and under surfaces. Above, 

 the cecidii are often lobed and with 

 linear impressions. A three-lobed form 

 with triradiate impression is common. 

 On the under side, the surface of the 

 galls is not impressed, and the shape is 

 more conical, the round or slightly 

 elongated opening being at the apex. 

 They are scattered irregularly over the 

 leaf, and may be very thickly placed. 

 On fully grown leaves cecidii measure 

 from i mm. to 2 mm. in diameter, and 

 are about 1 mm. in height on both sides 

 of the leaf, the projection above and 

 below being about equal. On younger 

 leaves cecidii often measure as little as 

 0.5 mm. in diameter. The walls are 

 thickened, and send into the cavity large 

 processes and ridges which occupy 

 much of the space. There are no hairs 

 inside or out. 



This deformation was first collected 

 in Virginia in the spring of 1882. Sub- 

 sequently it was found in various locali- 

 ties in southern Illinois, and has recently 

 been observed in Kentucky. It some- 

 times occurs on the same leaves as the 

 next, but thus far has proved most 

 abundant when not so associated. 



2. On the leaves of Nyssa multiflora. 

 This is a narrow upward and inward fold 

 of the margin of the leaf, and measures 

 from 0.5 mm. to 1 mm. in diameter. In 

 dried specimens the color is dark brown. 

 The leaf where folded is thickened, but 

 is not otherwise greatly changed. The 

 length of folds varies greatly, sometimes 

 being only a few millimeters long, and 

 again including the whole of the leaf 

 margin. The fold ultimately causes the 

 leaf to become scalloped, the scallops 

 measuring from about 2.5 mm. to 3 

 mm. in length. 



This cecidium has been collected in 

 Virginia, Illinois, and Kentucky. Phy- 

 topti from both of the preceding growths 

 have been examined. As far as I know 

 neither form of cecidium has been 

 hitherto described. 



3. On the leaves and petioles of 

 PoteJitilla canadensis. This consists 

 of whitish tufts of unicellular hairs, the 

 tufts measuring when isolated and well 

 grown about o.=; mm. in diameter. 

 The hairs themselves measure about 

 0.5 mm. in length, and large ones have 

 a diameter at the base of about 0.02 mm. 

 They taper regularly to a point, and 

 under the microscope have the appear- 

 ance of a tuft of grass blades. The 

 tufts are often so numerous and so closelv 



