Revision of Batrachospermum section Macrospora (Batrachospermales, Rhodophyta) with the establishment of the new genus Montagnia
Revision of Batrachospermum section Macrospora (Batrachospermales, Rhodophyta) with the establishment of the new genus Montagnia
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DOI：
10.1080/00318884.2019.1624143
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发表时间：
2019-07
期刊：
影响因子：
1.6
通讯作者：
Orlando Necchi Jr;Auro Silva Garcia Fo.;M. O. Paiano;M. L. Vis
中科院分区：
文献类型：
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作者：
Orlando Necchi Jr;Auro Silva Garcia Fo.;M. O. Paiano;M. L. Vis
摘要 为了解决 Batrachospermum 的副系问题，我们使用 DNA 序列数据和形态学对该属的切片进行了系统研究；这导致许多科被提升为属地位。 rbcL 和 COI-5P 组合的系统发育分析表明 Batrachospermum 部分 Macrospora 是一个得到充分支持的进化枝。我们建议 Montagnia gen。十一月Montagnia 与 Batrachospermales 的其他部分或属的区别在于以下特征：植物不规则分枝；果果分枝长而直，与束簇明显区别，具有冠状图案的总苞丝；果枝细胞中的凹坑连接扩大；以及具有大果孢子囊的有花梗果孢子植物。在新属中，我们通过检查模式标本以及来自北美和南美的样本，重新评估了用于界定物种的特征。在目前公认的属于 Montagnia 的三个物种中，我们识别出两个物种：M. macrospora 型物种（提议的同义词 Batrachospermum equaletifolium、B. hypergynum 和 B. macrosporum）和 M. australis（同义词 Batrachospermum australe）。由于样本内部和样本之间的差异，形态特征无法区分这两个物种。仅使用 DNA 序列数据和地理分布即可区分这两个物种。 Montagnia australis 仅限于北美；而大孢子菌是一种广泛分布于南美洲和亚洲的泛热带物种。尽管在巨孢分枝杆菌中观察到的种内分化是轮子精子目成员中报道最高的，但物种界定方法并没有表明超过一个物种是合理的。
ABSTRACT To resolve the paraphyly of Batrachospermum, the sections of the genus have been methodically investigated using DNA sequence data and morphology; this has resulted in the raising of many sections to genus status. Phylogenetic analyses of combined rbcL and COI-5P showed Batrachospermum section Macrospora to be a well-supported clade. We propose Montagnia gen. nov. Montagnia is distinguished from other sections or genera of the Batrachospermales by the following characters: plants irregularly branched; carpogonial branches long and straight and well differentiated from fascicles, bearing involucral filaments in a crown pattern; enlarged pit connections in the cells of carpogonial branches; and pedunculate carposporophytes with large carposporangia. Within the new genus, we re-evaluated the characters used to circumscribe species by examining type specimens as well as samples from North and South America. Of the three currently accepted species attributable to Montagnia, we recognised two species: M. macrospora–type species (proposed synonyms Batrachospermum equisetifolium, B. hypogynum and B. macrosporum) and M. australis (synonym Batrachospermum australe). Morphological characters did not distinguish the two species due to variation within and among samples. The two species can be differentiated only using DNA sequence data and geographic distribution. Montagnia australis is restricted to North America; whereas, M. macrospora is a widespread pantropical species occurring in South America and Asia. Although the intraspecific divergence observed in M. macrospora is the highest reported for members of Batrachospermales, species delimitation methods did not suggest that more than one species is justified.