The closest affinities of the Jubulaceae are with the Lejeuneaceae. The two families share in common: (a) elaters usually 1-spiral, trumpet-shaped and fixed to the capsule valves, distally.
If you say that someone has fixed ideas or opinions, you mean that they do not often change their ideas and opinions, although perhaps they should. people who have fixed ideas about things. flexible
(of a number) having a fixed and unchanging value securely placed or fastened or set; "a fixed piece of wood"; "a fixed resistor"
If someone has a fixed smile on their face, they are smiling even though they do not feel happy or pleased. I had to go through the rest of the evening with a fixed smile on my face
fixed and unmoving; "with eyes set in a fixed glassy stare"; "his bearded face already has a set hollow look"- Connor Cruise O'Brien; "a face rigid with pain