Asplenium rhizophyllum one collection on sandstone in the Shawnee Hills of Illinois. A triploid hybrid between walking fern and Tutwiler's spleenwort was accidentally produced in culture. A similar plant collected from limestone in Shepherdstown, West Virginia could have originated from the same parents, from an unreduced (diploid) gametophyte of Scott's spleenwort crossed with walking fern, or from an unreduced walking fern gametophyte crossed with ebony spleenwort. In 1813, Henry Muhlenberg listed lobed spleenwort as "Asplenium rhizophyllum" var. "pinnatifidum", although he did not provide a description distinguishing the variety from the typical species. It was described as the species "A. pinnatifidum" by Thomas
Audi Type P cc Audi Type Ps were produced. Audi themselves gives the precise number of Audi Type Ps as 327. The Audi Type P was not directly replaced: after 1932 Audi retreated from their brief excursion into compact cars, restricting themselves for the rest of the decade to large six-cylinder engined automobiles. Meanwhile the DKW F1 and its successors, introduced to fill unused capacity in what had been the Audi Zwickau plant, proved so popular that for the rest of the 1930s Audi's own cars had to be produced at Auto Union's nearby Horch plant. Audi Type P The Audi Type P