Odd root nodes on California Lilac 'Ceanothus'

Seattle, WA(Zone 8b)

Anyone know what these odd root nodes are on my Ceanothus? Had to move it today and found these attached in various areas of the root ball.

Thumbnail by RikerBear
Seattle, WA(Zone 8b)

2nd pic

Thumbnail by RikerBear
Seattle, WA(Zone 8b)

3rd pic

Thumbnail by RikerBear
N.C. Mts., NC(Zone 6b)

You ask hard questions. LOL

Seattle, WA(Zone 8b)

LOL! I actually think I found the answer....supposedly they're nitrogen nodules.
'A nitrogen-fixing bacteria called Frankia forms root nodules on Ceanothus.
http://www.laspilitas.com/plants/182.htm

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