I tried it and found it … inconclusive. When talking about eastern B.C. and this particular year, I would still expect to see more slime on the cap and stipe for most Gomphidius. The stature of the fungus suggests it has not been lacking available water. Yet there is no indication of slime anywhere. I’m surprised a Gomphidius was found this early in the year.
Drew believes G. maculatus has no yellow at base. But Arora et al. lump it with yellow-based Gomphidius. And yellow base of stipe is so ubiquitous for Gomphidius it is, in my opinion, not the best characteristic for identification.
For those not from the PNW, abundant rainfall this spring has been surprising while the rest of the country is baking. Oregon, for instance, has had record or near-record rainfall during March, April, and June this year.
Probably microscopy the best indication here. But single fruiting body also suggestive. Lack of slime also suggestive.
On a side note, I have just found that Gomphidius is known to concentrate up to 117,000,000 bequarels of Cesium-134 after Chernobyl in 1993. (http://dl.begellhouse.com/...) Suddenly I’m not much interested in the culinary properties of Gomphidius. But I hope Fukushima is taking note of what Chernobyl has already provided, in terms of Cesium remediation.