ABSTRACT Introduction. During a recent explorative field trip to the Western Ghats a new species of Riccia was discovered with possible links to the northern Australian species, Riccia caroliniana Na-Thalang. Key Results. Morphological similarities between the new species, R. sahyadrica and R. caroliniana include the ventral positioning of the photosynthetic tissue in the ventral section of the thallus in specialised structures known as ventral lamellae. These form a v-shaped patterning along the ventral surface of the thallus and are unique to these two species. Both species also bear similar spores with differences in the micro-ornamentation. Differences between the two species also extend to sexual condition, whereby R. caroliniana is dioicous and R. sahyadrica is monoicous. Conclusions. A new species, Riccia sahyadrica Manju & Cargill is described and illustrated and compared to the only other morphologically similar species, R. caroliniana endemic to northern Australia. Both species possess the unique characteristic of bearing ventral photosynthetic tissue in contrast to the dorsal position typically seen in all other Riccia species.

中文翻译：

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与澳大利亚北部有联系的新印度种 Riccia L.

摘要介绍。在最近对西高止山脉进行的一次探索性实地考察中，发现了一种新的 Riccia 物种，它可能与澳大利亚北部的 Riccia caroliniana Na-Thalang 物种有联系。关键结果。新物种 R. sahyadrica 和 R. caroliniana 之间的形态相似性包括光合组织在称为腹板的特殊结构中的叶状体腹侧部分的腹侧定位。它们沿着叶体的腹面形成 V 形图案，是这两个物种所独有的。这两个物种也带有相似的孢子，但在微装饰上有所不同。这两个物种之间的差异还扩展到性条件，即 R. caroliniana 是雌雄同株的，而 R. sahyadrica 是单一的。结论。一个新物种，Riccia sahyadrica Manju & Cargill 被描述和说明，并与唯一的其他形态相似的物种 R. caroliniana 进行了比较，后者是澳大利亚北部特有的。与在所有其他 Riccia 物种中常见的背侧位置相比，这两个物种都具有独特的腹侧光合组织特征。