Looks like it. One of those Cerei where the juvenile growth looks different to the mature flowering growth which grows bristly spines. That looks like a top cut which is reverting to juvenile growth again until it again attains the normal height for the bristly flowering area to form.
http://archive.bio.ed.ac.uk/jdeacon/des ... senita.htm" onclick="window.open(this.href);return false;
I once knew a collector who bought a top cut of Backebergia militaris which has a guardsmen(busby) type cap on top of about 30ft stems. He was most upset when the plant decided to grow a normal stem through the cap to get back to 30ft again, just as the top cut in the link below is doing. Mature top cuts don't always continue flowering and producing mature growth, but may revert to juvenile growth again until they regain their normal height:-
http://www.inaturalist.org/observations/488865" onclick="window.open(this.href);return false;
See normal height plant fifth photo down:-
http://www.agaves.nl/fieldtrips/Mex2009 ... -2-3-4.htm" onclick="window.open(this.href);return false;
Therefore if you get a top cut of some of these columnar cephalium or pseudocephalium bearing cacti they may revert to juvenile growth again until they obtain their normal height before once again producing mature stems.
