PAPERS GIVING RUSTS OF NORTH AMERICA. 261 



The host is undoubtedly some species of Rosa, and may well be 

 R. virginiana Mill, while the rust is undoubtedly Earlea speciosa 

 (Fries) Arth. The appearance of this material corresponds to 

 Schweinitz's description. 



Genus 243. Gymnosporangium. 



*3094. I. G. Juniperi, Lk. p. 127, n. i. Not frequent, but very distinct from 

 Podisoma Juniperi, found near Easton, Pennsylvania, on Juni- 

 perus virginiana. 



Represented by a mounted specimen, consisting of a woody stem, 

 II cm. long and 8 mm. in diameter, with a fusiform swelling from 

 which the sori have dropped away. The stem was broken into two 

 unequal parts before mounting. No original packet has been found. 



The rust is that of Gymnosporangium germinale (Schw.) Kern 

 (G. clavipes C. & P.), of wdiich the fecial form is given under 

 2904. 



Genus 244. Podisoma. 



*3095. I. P. Juniperi, Link, p. 127, found by me on a single Junip. Sabina 

 in this region — copiously developed. 



Represented by a mounted specimen, consisting of a four- 

 branched, woody stem, 5 cm. long, having a few subulate leaves each 

 about 5 mm. long, and with a few, slender, corneous sori remaining, 

 most of the telia having dropped out or been eaten by insects. No 

 original packet has been found. 



The rust is that of Gyjnnosporangium clavaricEforme (Jacq.) 

 DC., and the host is most likely Juniperus communis L., being the 

 common juniper, and not the red cedar as the name used by Schwei- 

 nitz would seem to indicate. 



3096. 2. P. macropus, L.v.S., Lk. p. 127 [error for 128], wrongly under 

 Gymnosporangium [in earlier work]. In the parts of North 

 Carolina best known to me a rather rare fungus. In Pennsyl- 

 vania very common, particularly affecting Juniperus virginiana 

 that has suffered by much pruning, and commonly known by the 

 name " Cedar apple," under which name it is offered in the 

 market as a powerful, though imaginary, vermifuge remedy. 

 Link expresses regret that I did not examine the structure of 

 the underlying sporidochium. Now such things as were not dis- 



