2006 年 100 巻 p. 77-87
The peristome characters in Glyphomitrium humillimum and their development are presented. The mature peristome conforms to the Seligeria-type, except for the extreme irregularity of inner peristome layer (IPL) and the frequent occurrence of misplaced cells in the primary peristome layer (PPL) column. The tooth structure depends almost entirely on PPL thickenings, with some contribution of outer peristome layer (OPL) walls, forming a basal exostome. In its development, the PPL reaches its final number of cells in early stages, the OPL arises from the exothecium and an OPL2 is formed either from exothecial or OPL cell divisions. In spite of this variable development of OPL2 and of the flexibility of the sequence of developmental events, the final pattern (8 exothecial cells: 8 OPL2 cells: 4 OPL cells: 2 PPL cell per octant) is very constant in all sections examined, suggesting it is a taxonomically stable character for the genus.