edit2: ok, I unlocked Tier 2 of the Mushroom Network, giving me another daily - while this one got me to Honored, I didn’t see the reputation gain in chat. Possibly related to the fact that you can’t see this reputation in the Reputation Frame.
This daily does not reward reputation with Marasmius - unlike the other dailies given by our mushroom overlord: https://www.wowhead.com/npc=167455/marasmius#starts
edit 10h later: Weirdly, Wowhead (now) states it rewards reputation (pretty sure it didn’t when I created this topic)
Could there be another factor? I’m at 5555/6000 Friendly, level 1 of the Mushroom Network. Close to Honored, but another daily (350rep) would not immediately take me to Honored either.