Porella pinnata L., 1753

Jarvis, Charlie, 2007, Chapter 7: Linnaean Plant Names and their Types (part P), Order out of Chaos. Linnaean Plant Types and their Types, London: Linnaean Society of London in association with the Natural History Museum, pp. 718-782 : 764

Porella pinnata Linnaeus , Species Plantarum 2: 1106. 1753.

"Habitat in Pensylvania." RCN: 7985.

Lectotype (Howe in Jarvis & al., Regnum Veg. 127: 78. 1993): [icon] " Porella pinnis obtusis" in Dillenius, Hist. Musc.: 459, t. 68, f. “Porella”. 1741. - Voucher: Herb. Dillenius ( OXF) .

Generitype of Porella Linnaeus.

Current name: Porella pinnata L. ( Porellaceae ).

Note: After an extensive discussion, Howe (in Bull. Toney Bot. Club 24: 518. 1897) treated the Dillenian material (OXF) associated with the cited Dillenius figure as the type of this name, followed in this by others such as Evans (in Rhodora 18: 82. 1916) and Grolle (in Feddes Repert. 87: 221. 1976). However, Linnaeus did not study Dillenius’ material and would have based his own account on Dillenius’ published description and illustration (Linnaeus wrote "Hanc neque ego vidi"). For this reason, Jarvis & al. designated the published illustration as the type, with the material as the typotype (while attributing the choice to Howe).