Didymium ochroideum G. Lister, J. Bot.

Lado, Carlos & Basanta, Diana Wrigley De, 2018, Typification of the myxomycete taxa described by the Listers and preserved at the Natural History Museum, London (BM), Phytotaxa 341 (1), pp. 448-450 : 448-450

Didymium ochroideum G. Lister, J. Bot. 69: 297. 1931

— Lectotypus (designated here): JAPAN. Tokyo Prefecture, Tokyo, the Palace Gardens, 35.6825ºN 139.7521ºE, 2 Jul 1930, the Emperor of Japan [Emperor Shôwa, Hirohito] ( BM 4780 !, BM001089813 + two slides, BM001223739 , BM001223740 , the first with the same number and dated “ July 1930 ”, the other without number but “ H.H. ’E’ dated “1931” and with a reference to the notebook XLV: 103) . Syntypus: INDIA. West Bengal, Serampore , 22.75ºN 88.34ºE, on dead leaves, Jan 1924, Mrs. John Drake ( BM 4082 !, BM001095147 ) . Syntypus: U.S.A. New York, Long Island, Albertson , 40º46’N 73º38’W, on dead wood, 18 Jul 1926, R. Hagelstein 986 ( BM 4081 !, BM001095148 ) .

BM 4780 / Didymium (fulvum?)/ ochroideum G. Lister sp. no. ε./ Loc: Tokyo. July 2.1930/ BM001089813 [and several characters in Japanese. On the sheet label dated 26 JAN.1932: “[BM] 4780/ Didymium ochroideum G. Lister / the Palace Gardens, Tokyo, Japan / July 2.1930./ Collected by the Emperor”] + two slides, [one with the same number and dated “ July 1930 ”], BM001223739, [the other without number but “H.H.’E’ dated “1931” and with a reference to the notebook XLV 103], BM001223740. BM 4082 / Didymium / ochroideum G. Lister / Serampore, Bengal/ Jan. 1924 Mrs. John Drake/ BM001095147 [box dated 26 JAN 1932, the sheet label dated 26 JAN. 1932 has the same data but adds the substrate “On dead leaves”]. BM 4081 / Didymium / ochroideum G. Lister / Albertson, Long Island, USA / leg. R. Hagelstein 18.7.1926 / BM001095148 [box dated 26 JAN. 1932. The sheet label dated 26 JAN. 1932 has the same data but adds the substrate “On dead wood”. Inside the box, the fragment of material is in a little piece of paper and with the text “Hag. 986”].

NOTES: G. Lister (1931: 297) described the new species based on material from the “Palace grounds, Tokyo, July

2, 1930; on dead leaves and rotten wood. Also Bengal and Long Island, U.S.A. ”. She received the Japanese material from “Dr. H. Hattori, of the Biological Laboratory, the Imperial Palace, Tokyo, Japan, with a request that I should identify them, and a note mentioning that all the specimens were collected and examined by the Emperor himself last summer”. Of the second collection she wrote “was collected by the late Mrs. John Drake on dead leaves near Serampore,

Bengala”, and the American collection “was obtained by Dr. Robert Hagelstein, on dead wood, at Albertson, Long

Island , U.S.A., in june 1926 ”. In BM we found the three collections mentioned. From them we designate the Japanes collection as the lectotype as it is the one used for the illustration in the publication (plate 598. 1a–d) and is in the best condition. There are 2 slides from Japan, one dated “July, 1930” and the other “1931” but this may refer to the publication year. In notebook XLV: 103–104 there are notes and illustrations of the Japanese material. In TNS there is one collection ( TNS –M R1290 ), with the same data ( Hagiwara 2005: 84) as the lectotype , that must be a duplicate and so an isolectotype.