Notes on Rafflesia (Rafflesiaceae) in Sumatra With a New Record Rafflesia Gadutensis Meijer

Abstract

MAHYUNI, R., KUSUMA,Y. W. C., WIHERMANTO & VELDKAMP, J. F. 2015. Notes on Rafflesia (Rafflesiaceae) in Sumatra with a new record Rafflesia gadutensis Meijer. Reinwardtia 14(2): 317 - 322. Pulau Mursala is a small island west of the Sibolga, Tapanuli Tengah District, North Sumatra, Indonesia. The occurrence of the genus Rafflesia (Rafflesiaceae) there has never been reported before. However, during a visit in April 2013 three populations are located close together with more than twenty buds and some rotting blooming flowers, Tetrastigma sp. was detected. Field observations could be made and material was collected for comparison with that in the Herbarium Bogoriense (BO). It was concluded that they are R.gadutensis Meijer, which is known from Padang, Ulu Gadut. Notes on its morphology are given. The distribution of species is discussed.

Rafflesia kemumu (Rafflesiaceae), a new species from Northern Bengkulu, Sumatra, Indonesia

“…Hence, we interpreted that Meijer's statement likely referred to the location at the boundary between the perigone tube and diaphragm and not to the upper part of the perigone tube. Our interpretation is matched by the illustration in Mahyuni et al (2015) showing branched ramenta, not toadstool, on the upper part of the perigone tube. Susatya et al (2017) also found compound toadstool ramenta only in the lower part of the diaphragm.…”

“…Key differences between R. kemumu and R. gadutensis are color of the perigone lobes; pattern, size, number, and color of warts on the upper surface of the perigone lobes; color and wart presence/absence on the upper surface of the diaphragm; blot arrangement of the two concentric rings of the windows closest to the diaphragm opening; types and distribution of ramenta; number and shapes of processes; and number of anthers (Table 1). Meijer (1984Meijer ( , 1997, Mahyuni et al (2015), and Susatya et al (2017) or obtained from photos by the late Prof.…”

“…The color of the upper surfaces of the perigone lobes and diaphragm of R. gadutensis was not described by Meijer (1984Meijer ( , 1997. Akhriadi et al (2010) and Mahyuni et al (2015) defined the color of the upper surface of the perigone lobes of R. gadutensis as pinkish to bright red and pale maroon red, respectively. We considered that the pinkish red is similar to maroon red.…”

“…Meijer (1984Meijer ( , 1997 reported that R. gadutensis has windows with five concentric rings of white blots on the lower surface of its diaphragm. Of the five concentric rings, the two rings closest to the diaphragm opening are arranged by merged or long rectangular warts of 0.20-2.00 cm (Mahyuni et al 2015) (FIG. 2C).…”

“…Rafflesia gadutensis is found in West Sumatra: around the Gunung Gadut area (Meijer 1984(Meijer , 1997 and at the Mohammad Hatta Forest Garden (Akhriadi et al 2010). Furthermore, a team from the Indonesian Institute of Science recently found this species at Mursala, a small island near Sibolga, on the western coast of North Sumatra (Mahyuni et al 2015).…”