Two New Species of Isoetes (Isoetaceae) from northern Brazil
Two New Species of Isoetes (Isoetaceae) from northern Brazil
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DOI：
10.11646/phytotaxa.272.2.5
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发表时间：
2016-08-29
期刊：
影响因子：
1.1
通讯作者：
Stutzel, Thomas
中科院分区：
文献类型：
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作者：
Pereira, Jovani B. De S.;Salino, Alexandre;Stutzel, Thomas
描述了产于巴西北部的两个新种：Serracarajensis和I.cangae，并与相似种进行了比较。Serracarajsis可通过一系列特征区别于其他物种，包括三角形到线形的小叶、肾形圆形唇瓣、覆盖多达1/5的孢子囊表面的不发育膜、暗棕色到红棕色的孢子囊和疣状大孢子(疣类型1)。等孢子囊虫表现为大的小叶、肾形的圆形唇瓣、仅覆盖1/4的孢子囊表面的不发育膜、透明的孢子囊和疣状(第2型)至具瘤的大孢子(第3型)。根据IUCN的标准，我们建议将Serracarajsis列为易危物种(VU)，将江南等珊瑚列为极度濒危物种(CR)。
Isoetes serracarajensis and I. cangae, two new species from northern Brazil, are described, illustrated, and compared to similar species. Isoetes serracarajensis can be distinguished from other species by a set of characters including triangular to linear microphylls, a reniform-orbicular labium, a rudimentary velum covering up to 1/5 of the sporangial surface, dark brown to red-brown sporangia and verrucate megaspores (verrucae type 1). Isoetes cangae presents large microphylls, a reniform-orbicular labium, a rudimentary velum covering only up to 1/4 of the sporangium surface, hyaline sporangia and verrucate (verrucae type 2) to tuberculate megaspores (tubercles type 3). Based on the IUCN criteria, we suggest that Isoetes serracarajensis should be classified as vulnerable (VU) and Isoetes cangae included as critically endangered (CR).