Two New Endemic Tetraploid Species of the Genus Isoëtes from the Brazilian Savanna

IF 0.9 3区生物学 Q4 EVOLUTIONARY BIOLOGY

Systematic Botany Pub Date : 2022-06-14 DOI:10.1600/036364422X16512564801704

Jovani B. S. Pereira, J. Prado

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引用次数: 1

Abstract

Abstract Isoëtes cipoensis and I. longifolia, two new endemic tetraploids from the Cerrado (Brazilian savanna), are described, illustrated, and compared to their similar species. Isoëtes cipoensis can be distinguished by a set of characters such as flaccid, straight, and erect leaves, deltate labia, presence of conspicuous sclerified phyllopodia, baculate megaspores with frequent long spine-like macroelements, and distally echinate microspores. Isoëtes longifolia is characterized by having a fully submerged habitat in the river, flaccid, long leaves (70–100 cm long), oblong labia, uniformly baculate megaspores, and densely echinate microspores. Importantly, chloroplast genomes already published for the species further support their phylogenetic distinctness in comparison to other species from the tropical region in Brazil. This study provides a key and distribution map for the species from the Brazilian savanna and scanning electron microscopy images of the mega- and microspores for the new species. These species are only known from their type location. We suggest I. cipoensis and I. longifolia should be classified as Data Deficient (DD) and Endangered (EN) species, respectively, based on the IUCN criteria.

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巴西热带稀树草原Isoëtes属二新种特有种

摘要描述、说明了巴西热带草原上两种新的特有四倍体——异叶和长叶异叶，并与它们的相似物种进行了比较。cipoensis可以通过一系列特征来区分，如叶片松弛、笔直和直立、唇三角洲、存在明显的硬肿叶足、具有频繁的长棘状大分子的杆状大孢子和远棘状小孢子。Isoëtes longifolia的特征是在河流中有一个完全淹没的栖息地，叶片松弛，长（70–100厘米长），唇缘长圆形，均匀的杆状大孢子，和密集的针状小孢子。重要的是，与巴西热带地区的其他物种相比，已经发表的该物种的叶绿体基因组进一步支持了其系统发育的独特性。本研究提供了巴西稀树草原物种的关键和分布图，并为新物种提供了巨型和小孢子的扫描电子显微镜图像。这些物种只能从它们的类型位置得知。根据国际自然保护联盟的标准，我们建议将长叶I.cipoensis和I.longifolia分别归类为数据不足（DD）和濒危（EN）物种。

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来源期刊

Systematic Botany 生物-进化生物学

CiteScore

1.80

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Systematic Botany Monographs is a series of peer-reviewed taxonomic monographs and revisions published the American Society of Plant Taxonomists. ISSN 0737-8211, ISBN prefix 978-0-912861. No; volumes of Systematic Botany Monographs must be ordered separately. ASPT membership inludes only a subscription to the quarterly journal Systematic Botany. SBM is supported by sales, author"s subsidies, and donations.