Tricholoma equestre

Tricholoma equestre (L.) P. Kumm.
Deu.: Grünling, Echter Ritterpilz.
Bot. syn.: Agaricus equestre L.

Tricholoma gambosum:

Tricholoma gambosum (Fr.) Gillet, Tricholomataceae: See Calocybe gambosa (Fr.) Donk.

Tricholoma nudum:

Tricholoma nudum (Bull.) Kumm., Tricholomataceae: See Lepista nuda (Bull.) Cooke.

Tricholoma portentosum

Tricholoma portentosum (Fr.) Quel.
Deu.: Grauer Ritterpilz.
Bot. syn.: Agaricus portentosus Fr.

I have no articles for this botanical term, but there might be some for the next level down (if found).