Mathiasen R, Nickrent D, Parks C, Beatty J, Sesnie S
School of Forestry, Box 15018, Northern Arizona University, Flagstaff, 86011.
Department of Plant Biology and Center for Systematic Biology, Southern Illinois University, Carbondale 62901.
Plant Dis. 2001 Apr;85(4):444. doi: 10.1094/PDIS.2001.85.4.444A.
Honduran dwarf mistletoe (Arceuthobium hondurense Hawksw. & Wiens) is a rare dwarf mistletoe previously known only from Honduras (1,2). In March 2000 we collected a dwarf mistletoe from approximately 7 km west of San Cristobal de las Casas, Chiapas, Mexico near Route 190 (elevation 2,440 m), which was morphologically similar to A. hondurense (1). This population had initially been classified as A. nigrumHawksw. & Wiens (1). However, our morphological measurements and analysis of nuclear rDNA ITS sequences of A. hondurense plants from Honduras (GenBank No. AF325969) and the plants from Chiapas (AF325970) have confirmed that the Chiapan population is A. hondurense and not A. nigrum. An additional population of A. hondurense was discovered in Chiapas approximately 11 km west of Oxchuc near Route 186 (elevation 2160 m). Both of the Chiapan populations of A. hondurense were parasitizing Pinus tecunumanii(Schw.) Eguiluz et Perry. Specimens of A. hondurense from Chiapas were deposited at the Deaver Herbarium, Northern Arizona University, Flagstaff. This is the first report of A. hondurense in Mexico and extends its known distribution from northwestern Honduras (3) by approximately 500 km. Although A. hondurense has not been observed in the pine forests of Guatemala, it is probable that it also occurs there (1). References: (1) F. G. Hawksworth and D. Wiens. 1996. Dwarf Mistletoes: Biology, Pathology, and Systematics. USDA Agric. Handb. 709. (2) R. Mathiasen et al. Phytologia 36:211, 1998. (3) R. Mathiasen et al. Plant Dis. 84:372, 2000.
洪都拉斯矮槲寄生（Arceuthobium hondurense Hawksw. & Wiens）是一种罕见的矮槲寄生，此前仅在洪都拉斯被发现（参考文献1,2）。2000年3月，我们在墨西哥恰帕斯州圣克里斯托瓦尔-德拉斯卡萨斯以西约7公里处、靠近190号公路（海拔2440米）采集到一种矮槲寄生，其形态与洪都拉斯矮槲寄生相似（参考文献1）。该种群最初被归类为黑矮槲寄生（A. nigrum Hawksw. & Wiens）（参考文献1）。然而，我们对来自洪都拉斯的洪都拉斯矮槲寄生植株（GenBank登录号AF325969）以及恰帕斯州植株（AF325970）的形态测量和核糖体DNA ITS序列分析证实，恰帕斯州的种群是洪都拉斯矮槲寄生，而非黑矮槲寄生。在恰帕斯州奥楚克以西约11公里处、靠近186号公路（海拔2160米）又发现了另一处洪都拉斯矮槲寄生种群。恰帕斯州的这两处洪都拉斯矮槲寄生种群均寄生于特昆乌曼松（Pinus tecunumanii (Schw.) Eguiluz et Perry）。来自恰帕斯州的洪都拉斯矮槲寄生标本存放在弗拉格斯塔夫北亚利桑那大学的迪弗植物标本馆。这是洪都拉斯矮槲寄生在墨西哥的首次报道，其已知分布范围从洪都拉斯西北部（参考文献3）向北扩展了约500公里。尽管在危地马拉的松林中未观察到洪都拉斯矮槲寄生，但它很可能也存在于那里（参考文献1）。参考文献：（1）F. G. Hawksworth和D. Wiens。1996年。《矮槲寄生：生物学、病理学与分类学》。美国农业部农业手册709。（2）R. Mathiasen等人。《植物学杂志》36:211，1998年。（3）R. Mathiasen等人。《植物病害》84:372，2000年。
