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Mud Dauber nest? - Pseudomasaris

Mud Dauber nest? - Pseudomasaris
Old Mill site in Westwood, Lassen County, California, USA
July 27, 2010
Could this possibly be a nest of Sceliphron caementarium, the yellow & black mud dauber wasp? This mud nest was on a spindly mustard species plant in full all day sunshine. Usually I see mud dauber nest in dark shaded areas, so this one has me a bit puzzled. Any ID help or comments appreciated - Thanks!

Moved from ID Request.
No, this is much more exciting--it's a pollen wasp nest! Nice find!

Thank you Charley!
That is exciting! The one pollen wasp, Pseudomasaris vespoides that I have thus far seen up here can be viewed here (1) on the Guide. Hartmut Wisch mentions two other species that live in my this area: P. zonalis and P. edwardsii.

For what it's worth,
P. vespoides is the only species known to attach its nests to stems like this, but I don't know how well studied the other species are.

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