Feature branch for biomass related functionality

docs/source/api/models/plants/plant_structures.md

@@ -67,6 +67,14 @@ This page documents submodules of the `plants` module used to support the centra
     :members:
 ```
 
+## The plants {mod}`~virtual_ecosystem.models.plants.biomasses` module
+
+```{eval-rst}
+.. automodule:: virtual_ecosystem.models.plants.biomasses
+    :autosummary:
+    :members:
+```
+
 ## The plants {mod}`~virtual_ecosystem.models.plants.subcanopy` module
 
 ```{eval-rst}