绒苔属(Trichocolea Dumort.)的成熟雌苞,经解剖实验证实为颈卵器分化发育的蒴帽(Calyptra)。
The mutural perichaetium of Trichocolea Dumort. was supposed as Calyptra developing from archegonium, after observing the cross-section and longisection of perichaetium.