242 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



A duplicate packet of the last contains two pieces of similarly 

 rusted leaves, about 3.5 cm. long, and is labelled " 5 Puccinia pvuic- 

 tum Lk caricicola LvS." 



*2gog. 5. P. Scirpi, Lk. n. 4, on various Scirpi, Bethlehem. 



Represented by the original packet, containing very scanty shreds 

 of leaf blades or sheaths, some of them 3-6 cm. long, and labelled 

 on the inside " Puccinia Scirpi Beth 1826," and on the outside " 2 

 Puccinia Scirpi Beth." The rust is clearly the telial stage of Puc- 

 cinia angustata Peck, and the host is doubtless Scirpiis cyperinus 

 (L.) Kunth. It is entirely different from genuine P. Scirpi Link. 



*29io. 6. P. Sorghi, L.v.S., frequent on the leaves of Sorghum and Zea 

 cultivated. 

 P. without spots. Sori broad, difform, variously lobed, at first cov- 

 ered by the epidermis, at length naked but surrounded at the 

 margin, and then the epidermis lacerate. Sori often also as if 

 lobed from the center — 2-4 lines long and broad. Larger sori 

 occur on the nerves of the leaves. Spores blackish, large, shortly 

 pedicelled. 



Represented by some twenty-five pieces, 1-3 cm. wide and 3-8 

 cm. long, of leaves of Indian corn, abundantly covered with telia, 

 contained in the original packet, which is labelled " Puccinia Sorghi 

 LvS Lititz," with a later addition of " & Zese." 



The leaves in the original packet are all without question those 

 of Zca Mays L., and the rust is the one common to that host. One 

 can only surmise why Schweinitz called the rust P. Sorghi, and said 

 it was on Sorghum, a genus which has never been known to harbor 

 the rust. But it would seem from the labelling of the packet that 

 Schweinitz thought at first he had to do only with a Sorghum rust, 

 and afterward found it w^as certainly on Zea, so assumed that it 

 was on both kinds of hosts. 



Because of the inappropriateness of the specific name, some 

 taxonomists have adopted some other name, but most authorities 

 still use Schweinitz's original name on the ground of priority. The 

 alternate stage has been found by cultures to occur on species of 

 Oxalis. 



