I'm afraid that I can't be too helpful with specifics, due to lack of being in the area, but I might throw in some thoughts on collecting, in general.
First stop is to explain that I DO NOT tolerate, nor encourage breaking the rules! But then I also favor making sure the rules are clearly understood, so that I can work within those rules. Many of the rules are written in such a way that they sound like something is totally ruled out, when in fact, some leeway is expected. Consider that many places have rules stating that one cannot "disturb the soil". Does that mean that one cannot take a walk and scuff his feet? Certainly not, so there is a grey area that we all deal with as users and enforcement. So we need to look a bit deeper and at times, that means asking the local folks what is acceptable and what is not.
I have worked and been a volunteer in several spots across the country and there is one common item in most places. They appreciate folks who try to find out what the rules mean and try to follow them without debate, fussing or complaint! So when you find a spot that has something you might want to collect but the rules seem to say "no", it is sometimes really worthwhile to simply ask the person at that site and get a clear understanding of what is expected.
Some species of manzanita are highly debated in California and the rules are often read as totally ruling out any collection. But if you ask a ranger in the campgrounds where they stack dead wood out for campfires, you may find them totally agreeable to taking a couple sticks home for the tank. That doesn't mean you should expect to take a truck full home to sell but they may find it fine to take some home versus burning it in the campfire!
Ask in a courteous and respectful way of a fellow who is not already overworked, and you may find legal collecting much easier. if he says "no", accept it, but if he says "fine", you have no problem!