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12 期                       殷钰皎等: 皖西大别山区梅衣科地衣的分类研究                                         2 1 7 3
            15. 树生ꎬ具粉芽ꎬ下表面黑色     (皱衣属 Flavoparmelia)皱衣 F. caperata

            16. 有假杯点   17
            16. 无假杯点   22
            17. 裂片较宽(3~ 33 mm)  (斑叶属 Cetrelia)18
            17. 裂片较窄(1~ 10 mm)   20
            18. 具裂芽ꎬ髓层 C-ꎬKC+淡红色ꎬ含有 α ̄collatolic acid、树发酸(alectoronic acid)    粒芽斑叶 C. braunsiana
            18. 不具有营养繁殖体  19
            19. 假杯点直径大于 1 mmꎬ含有 microphyllinic acid   日本斑叶 C. japonica
            19. 假杯点直径不超过 0.5 mmꎬ含有橄榄陶酸(olivetoric acid)     拟橄榄斑叶 C. pseudolivetorum
            20. 假杯点条形、线形ꎬ含有水杨嗪酸(salazinic acid)ꎬ假根稠密ꎬ单一至树杈状分枝                  
                   (梅衣属 Parmelia)蛇纹梅衣 P. marmariza
            20. 假杯点斑点状ꎬ不含水杨嗪酸(salazinic acid)   (星点梅属 Punctelia)21
            21. 具有粉芽ꎬ含三苔色酸(gyrophoric acid)   粉斑星点梅 P. borreri
            21. 具裂芽和小裂片ꎬ含茶渍衣酸(lecanoric acid)         粗星点梅 P. rudecta
            22. 裂片较宽(4~ 10 mm)ꎬ假根短小于 0.2 mmꎬ丰富的二叉分枝ꎬ具裂芽ꎬ单一至偶珊瑚状分枝ꎬ颗粒状至圆柱状与上表面
            同色ꎬ顶端浅棕色   (隐糙梅属 Remototrachyna)隐糙梅 R. incognita

            22. 裂片较窄(2~ 5 mm)ꎬ假根长 0.5~ 2.0 mmꎬ稀疏至丰富的二叉分枝          (双歧根属 Hypotrachyna)23
            23. 具裂芽   稠芽双歧根 H. minarum
            23. 具粉芽或疱状体  24
            24. 具有粉芽ꎬ近顶生或顶生形成头状粉芽堆ꎬ含有原岛衣酸(protocetraric acid)               灰条双歧根 H. pseudosinuosa

            24. 具粉芽和疱状体  25
            25. 上皮层 UV+黄色ꎬ髓层 K+淡褐色ꎬ含有 lichexanthone、lividic acid   骨白双歧根 H. osseoalba
            25. 上皮层 UV-ꎬ髓层 K-ꎬ含有 4-O-去甲基巴尔巴酸(4 ̄O ̄demethylbarbatic acid)、树花地衣酸(obtusatic acid) 
                  切割双歧根 H. exsecta



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