Typification and interpretation of Philodendron imbe Schott ex Kunth (Araceae)

Abstract

The name Philodendron imbe has been used for at least three species of hemi–epiphytic Philodendron species of medium stature with cordate to cordate–sagittate leaves occurring in the Atlantic Forest region of Brazil. Many specimens so determined are found throughout the world's herbaria, especially in Brazil, North America, and Europe. This investigation shows that descriptions made by H.W. Schott in 1832, 1856, and 1860 differ from those of species to which the name has been most widely applied ever since; in particular, from P. acutatum Schott and P. appendiculatum Nadruz & Mayo. The name Philodendron imbe is here neotypified on plate 34, published in J. Peyritsch's Aroideae Maximilianae in 1879, based on a collection made by Franz Maly in the region of Rio de Janeiro. We propose that P. imbe is a rare and possibly extinct species from the Atlantic Forest of Rio de Janeiro State which has not been correctly identified in any collections made since 1860.

IAPT chromosome data 40

“…It is a hemiepiphytic species, morphologically characterized by having leaves with a sagittate or cordate base and an acuminate or acute apex of variable size (Sakuragui & al., 2005). Material of this species was long identified as P. imbe Schott ex Kunth, a morphologically distinct taxon, most likely extinct in the wild (Mayo & Sakuragui, 2011). Our chromosome count of 2n = 32 differs from older counts for the species with 2n = 34 (Petersen, 1989), but it confirms the more recent count by Vilar & al.…”

The anatomical studies on two Biarum (Araceae) species in Turkey

“…This provision is generally found in leaves of monocotyledons (Metcalfe 1963). However, Mayo (1986) showed randomly distributed small cells in the epidermis of the spathe species of Philodendron Schott (Araceae). The number and distribution of cells subsidiaries of stomata are vary significantly in Araceae (French et al 1995).…”

Recognition of the genus Thaumatophyllum Schott − formerly Philodendron subg. Meconostigma (Araceae) − based on molecular and morphological evidence

“…The central dome may be excavated itself into a pit or even a long canal and may itself have lobed margins. The gynoecial type, typical of Thaumatophyllum , was designated by Mayo (1986 , 1989 , 1991 ) as type A, based on a sample of only four species. Calazans et al (2014) studied 19 out of 21 species and recognised a further three subtypes within Mayo’s type A: subtype A1: stylar body absent and stylar canals short, central stylar dome absent and compitum deep ( T. adamantinum , T. dardanianum , T. speciosum and T. williamsii ); subtype A2: undeveloped stylar body present with long stylar canals, central stylar dome absent and compitum shallow ( T. corcovadense , T. lundii , T. paludicola , T. saxicola , T. stenolobum , T. tweedieanum and T. uliginosum ); subtype A3: well developed stylar body present with stylar canals long, central stylar dome present and compitum shallow ( T. bipinnatifidum , T. brasiliense , T. mello-barretoanum , T. petraeum , T. spruceanum , T. solimoesense , T. undulatum and T. venezuelense ).…”