The grammitid genus Scleroglossum in China. A–E Scleroglossum pusillum in Yunnan (YunAcc) and F–H Scleroglossum sulcatum in Hainan (HaiAcc). A habitat of S. pusillum occurrences in Yunnan B germinated green spore recovered from opened mature sporangia of S. pusillum. The remains of the spore wall are visible at the lower part of the larger of the two cells that both contain mature chloroplasts. The smaller cell is the first daughter cell formed by the first cell division C habit of S. pusillum D close up of the dorsal surface of the simple leaves showing the location of the submarginal sori and the occurrences of brown branched hairs of S. pusillum E close up of the sorus structure showing the placement at the submargin of the leaves in S. pusillum. F habit of S. sulcatum G close up of the dorsal surface of the simple leaves showing the location of the not submarginal sori and the occurrences of brown branched hairs of S. sulcatum H close up of the sorus structure showing the placement of the sori in dorsal grooves and a distinct lamina margin in S. sulcatum. Scale bars: 0.02 mm (B); 1 mm (E, H).