Spotting

Similar species of mushroom do regularly occur close together, however with this spotting I'd suggest that the mushrooms are the same and the smell has developed.

Agaricus is a hard genus, really it requires microscopic examination. Failing that always record smell and the colour the flesh turns where cut. If you're keen to peruse this ID further I'd recommend uploading it to Mushroom Observer. No one will be able to help you as much as them.

http://mushroomobserver.org/?_js=on&...

It hardly ever snows in Seattle. It was quite some way from the sideway... about 20-30 ft. By the way the smaller one beside it had a minty smell. So, unless I lack the tasters' nose, it is unlikely that this is the same as the other. The question that can be posed here is: can two different species of fungi exist so close to one another?

Fishy eh?.. Is there any reason salt might have built up in that area, for example by the side of the road where salt is spread to ease winter freezing? The only Agaricus species I know of with a fishy/briney odour is Agaricus bernardii. It does display that rugged cap texture of the larger mushroom but I'm not 100% about the dark scales...

Some sort of Agaricus sp.
It might be Agaricus perobscurus...

I think it is different, I.e the bigger one. I have posted a few more pics . Its flesh smells like fish.

Same as here http://www.projectnoah.org/spottings/259...

You may know this but to identify fungi, it would help to have the size of the cap and a shot of the underside (gills/pores). Looks like pine needles on the ground ?

Nice one ! Do you remember what tree these were under ?