Frullania inflata Gottsche (as Lejeunia serphyllifolia)
Plate of original, pencil line-drawings by Mary F. Linder. Her legend is given below.

"Explanation of Plate XVIII.

1. Lejeunia serphyllifolia - natural size.
2. A portion of the plant enlarged.
3. The parianth [sic] and its contents enlarged about 100 times -
  a- the valves -
  b- the calyptra
  c- the sporogonium -
4. A spore as seen under 3/4 obj-
5. The same under the 1/5 obj.-
6. An Elater as seen under the 1/5 obj."

Courtesy of University of Iowa Libraries, Special Collections