diff --git a/df_primordial_items/fungal_nodes.lua b/df_primordial_items/fungal_nodes.lua
index 9b0b02b..88ead4b 100644
--- a/df_primordial_items/fungal_nodes.lua
+++ b/df_primordial_items/fungal_nodes.lua
@@ -122,7 +122,7 @@ minetest.register_node("df_primordial_items:dirt_with_mycelium", {
 	_doc_items_longdesc = df_primordial_items.doc.dirt_with_mycelium_desc,
 	_doc_items_usagehelp = df_primordial_items.doc.dirt_with_mycelium_usage,
 	tiles = {"dfcaverns_mush_soil.png"},
-	groups = {crumbly = 3, soil = 1, light_sensitive_fungus = 12},
+	groups = {crumbly = 3, soil = 1, light_sensitive_fungus = 13},
 	_dfcaverns_dead_node = df_primordial_items.node_names.dirt,
 	is_ground_content = false,
 	paramtype = "light",
diff --git a/df_primordial_items/giant_fern.lua b/df_primordial_items/giant_fern.lua
index 35c6aa2..67d5b1d 100644
--- a/df_primordial_items/giant_fern.lua
+++ b/df_primordial_items/giant_fern.lua
@@ -146,6 +146,8 @@ minetest.register_craft({
 	}
 })
 
+df_trees.register_all_stairs("fern_wood")
+
 minetest.register_node("df_primordial_items:giant_fern_leaves", {
 	description = S("Giant Fern Leaves"),
 	_doc_items_longdesc = df_primordial_items.doc.giant_fern_desc,
diff --git a/df_primordial_items/jungle_mushroom.lua b/df_primordial_items/jungle_mushroom.lua
index da3de57..9b55065 100644
--- a/df_primordial_items/jungle_mushroom.lua
+++ b/df_primordial_items/jungle_mushroom.lua
@@ -80,7 +80,7 @@ minetest.register_craft({
 	recipe = { "group:primordial_mushroom_cap"},
 })
 
--- Note: no wood-making recipe for the trunk, it's pretty useless
+-- Note: no wood-making recipe for the trunk, it's deliberately pretty useless since the cap is edible
 minetest.register_craft({
 	type = "fuel",
 	recipe = "df_primordial_items:jungle_mushroom_trunk",
diff --git a/df_primordial_items/primordial_mushroom.lua b/df_primordial_items/primordial_mushroom.lua
index 9869738..88ae053 100644
--- a/df_primordial_items/primordial_mushroom.lua
+++ b/df_primordial_items/primordial_mushroom.lua
@@ -115,6 +115,8 @@ minetest.register_craft({
 	}
 })
 
+df_trees.register_all_stairs("primordial_mush_trunk_wood")
+
 minetest.register_node("df_primordial_items:primordial_mush_cap_wood", {
 	description = S("Primordial Cap Wood"),
 	_doc_items_longdesc = df_primordial_items.doc.giant_mushroom_desc,
@@ -133,6 +135,8 @@ minetest.register_craft({
 	}
 })
 
+df_trees.register_all_stairs("primordial_mush_cap_wood")
+
 ------
 -- Schematics:
 -- Originally created by ClockGen, released under CC-BY 4.0
diff --git a/df_trees/init.lua b/df_trees/init.lua
index 45f0bdb..bd154b1 100644
--- a/df_trees/init.lua
+++ b/df_trees/init.lua
@@ -13,7 +13,7 @@ dofile(modpath.."/aliases.lua")
 local S = df_trees.S
 
 df_trees.register_all_stairs = function(name, override_def)
-	local mod = "df_trees"
+	local mod = minetest.get_current_modname()
 
 	local node_def = minetest.registered_nodes[mod..":"..name]
 	override_def = override_def or {}