pure white toadstool

here's a picture of one

IMG_0293.jpg
 
there might be some exotic species that tend to be more on the white side typically (e.g. s. ehrenbergi or some deepwater?) but i agree with randall that it's more likely a stressed or young sarco that appears as such.

as sarcos grow they will change color and morphology. sometimes this is a function of the envrionment (light, flow, and food) and sometimes it's genetic. for instance, almost all sarcos start out in the common "toadstool" shape when they're young (either sexually propagated or asexually propagated). but as they mature, some species will morph into their adult forms that look very little like their young states, e.g. s. latum or s. roseum.
 
Those are fairly common. They aren't really white. They are more like a light tan color. The one in the picture looks like an offspring. I've had that size before and they usually turn to a darker tan as they get larger. What book did you get that picture from?
 
a practical guide to corals for the reef aquarium by Ed Puterbaugh
and Eric Borneman

It says that it's notable for it's light tan to pure white coloration and small size
 
That's what I thought, I have the same book. I'm not sure why he labeled them as white toadstools. Everybook, I have seen on corals has always listed toadstools, as brown, tan, or green. There are no other variations that haven't been dyed.
 
I've seen ones like that here, but they don't look that healthy or are very small. If you want nice toadstool, I would go for the neon green ones.
 
I might have one off those, a large on in fact. a month after i purchase i relize that there was a very small offspring on the under side of the rock. now it has developed its polyp and is more distinguishable. it is the size of a dime right now.
 
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