PAPERS GIVING RUSTS OF NORTH AMERICA. 203 



place, is as follows. The texture of tlie base at that time inside is like the 

 flesh of a ripe apple — if cut into slices with a knife — the color is greenish 

 white as in a green apple ; oozy-cellular, apparently radiating from the stalk. 

 The green color soon changes to tawny orange — and then may be seen a few 

 white branching fibers radiating from the stalk. As soon as the ligules are 

 protruded on account dI rainy weather, the base grows no more; but if the 

 weather is not rainy tlic base enlarges day l)y day. The epidermis of the 

 younger sporidochia, before their full maturity, has a somewhat iilamentous- 

 scaly texture, and the thickness of the skin of an apple. In their mature 

 condition the ligules are covered with sporidia, just as in P. Juniperi — but 

 the ligules are usually longer and not conic, often subflexuous and more 

 attenuate toward the apex. 



The asterisk was probably omitted from this number by mis- 

 take. Schweinitz evidently had many doubts about the true nature 

 of this fungus and its generic position. In the North Carolina hst 

 he did not add " Sz.'' to the name, nor did he supply a technical 

 diagnosis, as in tlic case of his other new species. This may have 

 been an accidental omission while in editorial hands, but is more 

 likely an indication that Schweinitz hesitated regarding the best pro- 

 cedure. 



(504. I. [Gymnosporangium] Juniperi Virginianse. 



N. B. Wholly to be separated, I believe, from the genus Puc- 

 cinia, and to constitute with Podisoma Juniperi, on tlie European 

 Sabina, a new genus, even of this order? (that Podisoma Juniperi 

 should be reunited with Gymnosporangium Juniperi, Nees himself 

 affirms). In both the form and substance of the gelatinous ligule, 

 loaded with spores, it agrees with the European fungus mentioned ; 

 but ours has a remarkable base, a thing never seen in the European. 

 This base, as I have termed it, a somewhat corky-fleshy bod}-, is 

 quite like the flesh of Boletus hepaticus, even in color, and is borne 

 on an obconic stalk, attached by its tip to the slender branches of 

 our cedars ( Juniperus Virginiana) at the very top of the trees ; — 

 from this it changes into a hard (almost woody) capitulum, ex- 

 panded, with incurved margins, marked with many pits, from which 

 in wet weather are protruded the ligules, which when they have 

 been dropped leave the pits emptj-. The color of the base is flesh- 

 gray, of the fungus when fruiting and extruding the ligules strongly 

 greenish golden, attracting the eye from a distance. Also, the capit- 

 ulum is pendulous, and has a diameter of two to four inches. 



Spores covering the external surface of the ligules. linear- 

 oblong, somewhat curved, two-celled, when again wet after drying 

 yellowish, exactly like Nees's illustration characterizing Gymno- 

 sporangium.) 



