In my avatar you cannot even see the base.. Perhaps it has much darker coloration...
It doesn't. The portion that shows in the pic is drastically bleached, with absolutely no signs of zooxanthellae. Other areas of the anemone may have visible signs of zooxanthellae, but it will not be "much darker". I've seen anemones bleach in areas, and recover from bleaching in some areas before others, but you won't get the drastic bleaching, shown in your avatar, while the rest of the anemone is affected. If it is that bad in the pic, then the rest of the anemone has been effected as well. Maybe not to that extreme, but it has been effected.
So you are saying that there are no solid white, or predominately solid white anemones (like my avatar, or the haddoni on the cover) that are not bleached?
Correct. There are no photosynthetic, zooxanthellae containing, anemones that are that white. If they contain zooxanthellae, they will show, and cause the anemone to look brownish where those zooxanthellae are. If there is no brownish color, there are no zooxanthellae, and the anemone is bleached.
The BTA and the LTA (not sure on ID) on the cover clearly have the darker areas of zooxanthellae that you are pointing to in your picture.. The crispa (front and back) and haddoni seem to have white pigmentation that is produced by the anemone.. I would bet that if we had detailed pictures we would see zooxanthellae there also.
If you had a microscope, or strong magnifying glass, you may be able to spot some zooxanthellae. That doesn't change the fact that these anemones are bleached. In an anemone that isn't bleached, you don't need these tools to detect their zooxanthellae. The zooxanthellae are obvious in anemones that are not bleached.
Are you saying that these anemone are unhealthy and/or lacking in zooxanthellae and will not survive in their current condition?
I'm not judging health. An anemone can discharge its zooxanthellae and still be healthy. There are many variable that come in to play here. The anemone may bleach simply from a stressful situation, and not receive any physical damage in the process. In which case, the anemone would be healthy shortly after bleaching. If the anemone bleached because it was exposed to to much light, the oxidant level within its tissues could climb to high. Cellular damage could occur, and the anemone would not be healthy shortly after bleaching.
To me they are sure appear to be healthy whitish colored anemones..
I would agree with this. The race is on though. The anemone must regain its zooxanthellae if long term survival, and health is to be obtained. Under the right conditions, an anemone can live in the bleached state, for quite a long time. I've seen them last for over a year. Eventually, they will either regain their zooxanthellae, or suffer malnutrition and die.