Help deciphering classic calligraphy on painting

Dear users, I would like your help deciphering this waka adorning a painting I purchased at auction. Kanō Morinobu (主信) chrysanthemum scroll. I can decipher the gist of it regarding autumn dew on chrysanthemums... Any help is welcome!!

Konnichiwa seroni-san!

I think this poem was made to be based on a poem originally written by Saigyo, a poet from the Kamakura period.


The rightmost column represents the title.

秋深き山行:あきふかきさんこう:Aki Fukaki Sankou:Autumn mountain hiking


The following is the text of the poem.

しるべの:Shirubeno:signpost

たてぬれば:Tatenureba:set it up

かはらすや:Kawarasuya:don't get lost

The text up to this point is the same as the original. However, the last two lines are different.


The original text is only one line long.
花の跡まで(はなのあとまで):Hana no Ato made:to the traces of flowers


However, the poem on the hanging scroll has two lines at the end. I cannot decipher this part either.


The text on the very last line is the author's signature.
黄中:こうちゅう:kouchuu or kōchū


I apologize for the incomplete translation.

NANGI

黄中 (Kōchū, sometimes rendered as Ōchū) was the pen-name of Kagawa Kagemoto (香川景柄), so it must be a poem from Kagawa Kagemoto.

My gut feeling is the first line is 秋深き山の （秋深き山能 in hentaigana). But after that I am lost. I agree it is probably based on the poem that Nangi-san mentioned.