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(Icacinaceae) the Scrutiny of These Type Fragments at First Them, Which

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(Icacinaceae) the Scrutiny of These Type Fragments at First Them, Which The identity of Plectomirtha Oliv. with Pennantia J. R. & G. Forster (Icacinaceae) H. Sleumer R. Oliver described the collected In 1948, W. B. new monotypic genus Plectomirtha, from of by G. T. S. Baylis in 1945 a single tree on a small rocky islet the Three King’s Islands off New Zealand. He placed it in the Anacardiaceae, a family hitherto absent from This from New Zealand. aroused a certain curiosity both a taxonomic and plantgeo- because much occurred graphic point of view, it wouldbe intriguing if an endemic genus there. asked from This was the reason why Dr C. G. G. J. van Steenis Prof. G. T. S. Baylis the University of Otago, Dunedin, N.Z., for original material to be able to elucidate this the of flowers and conserved case. A fragment of holotype, consisting a few a leaf, in the and became available October Auckland Institute Museum, to our institute in 1954 by the of courtesy Dr R. Cooper. The of first there scrutiny these type fragments at had no results, as were no fruits with them, which, according to later information by Prof. Baylis, could not be obtained from the original tree because it sets no seed. An examinationof the pollen by Prof. G. Erdtman showed the in 1956 'that pollen grains are too young to be used as material for a detailed pollen diagnosis. However, it is impossible for these to be anacardiacious'. The material has further the first a since undergone study in Rijksherbarium, by Dr Ding Hou, spe- cialist in Anacardiaceae, who foundno good reason to exclude Plectomirtha from, but also hesitated to attach it to that family, as only the mature fruitwouldbe decisive in this case. the had far reached the conclusion Mr P. Baas, on investigating vegetative anatomy, so that Plectomirtha could the the of hardly belong to Anacardiaceae, on grounds amongst others its very primitive secondary xylem and the absence of resin canals. The petiole the distal of seen in transverse section through end shows one the more striking ana- vascular is of tomical features: the system composed a large cylinder, enclosing one side smaller bundle and accompanied on each by two concentric adaxial bundles. the Finally, specimen came accidentally tmder my eyes and, being familiar with the Icacinaceae which I had just revised for Asia and Malesia and partly for the Pacific, I the Plectomirtha Oliver the recognized enigmatic baylisiana W. B. R. as being same as endlicheri Norfolk I. Pennantia Reiss., described in 1842 from and up till now only known from there. confirm of from To this, four specimens P. endlicheri Norfolk I., kindly sent on loan with the by the Director of the Royal Botanic Gardens at Kew, were compared original material of Plectomirtha baylisiana. Of these four specimens two bear flowers, and two Plectomirtha bears are in fruit, whereas the type of bisexual, or presumably functionally the not well female flowers, as pollen is developed. The is known When genus Pennantia as polygamous. comparing these specimens, not character of value could be found which would allow a single taxonomic to separate Plectomirtha baylisiana from Pennantia endlicheri; these species share even the domatia which are not known from the other species ot Pennantia. 217 BLUMEA VOL. No. 218 XVIII, i. 1970 An examination by Mr J. Muller of the pollen grains of Plectomirtha confirmed that A is they are not normally developed. large proportion shriveled, apertures are mostly and there this be not clearly visible, is some variation in size. However, may not dueto the fact the grains being too young, as supposed by Erdtman, but to the that available female. of few well flowers are apparently functionally A comparison a rather developed with of a flower of endlicheri Cornish revealed that at least grains pollen P. (Mc 35, K) the wall structure is strikingly similar. The apertures, although poorly developed in the distinct of the former Plectomirtha, appear to approach tricolpate ones species, while the also average size agrees. Thereexist thus no palynological objections against merging Plectomirtha with Pennantia. the leaf and the of the of Mr P. Baas recently compared epidermis anatomy petiole Plectomirtha with thoseof Wales Herb. Pennantia cunninghamii Miers (N. S. Nat. 11151, L) and of Pennantia endlicheri Reiss. ([Cunningham 8$, K). He found these to be principally small which of the same kind, though very differences occur may even be expected within the be of the the here same species. The same can said anatomy of stem, though material of thickness available. There is almost evidence from no equal was ioo % ana- tomical features that Plectomirtha belongs to Pennantia. Unfortunately, at the moment there is not sufficient material in our hands to ascertain that anatomically seen Plecto- mirtha baylisiana is conspecific with Pennantia endlicheri. Plant-geographically, the identity is not too surprising, as Norfolk I. is only about km from the Three other floristic relations themand the 650 away King's Is, and between Zealand's North and least the flora of New Island, even to Australia, are known at at generic level..
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