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
Honda D-Type was completed in August 1949. Production began at the company's Hamamatsu factory. By late 1949 frames for the D-Type were being produced in the Yamashita plant in Hamamatsu and engines were coming from the Noguchi-cho plant. Officially the origin of the "Dream" name is unknown. The most commonly reported story is that at a party to celebrate the completion of the D-Type an employee spontaneously remarked "It's like a dream!" Honda felt that the D-Type was a step on the path to fulfilling his own aspirations, and made the bike's official name "Dream Type D". The D-Type proved popular and