white/clear mushrooms

[pullins125]

i bought a piece of rock with alot of different mushrooms on it when i first started my tank. it is doing great. mushrooms are multipling and everything. i just saw that i now have 2 whitish clear mushrooms. i have never seen these before anywhere. how rare are these? or is it like a mixing of mushrooms causing it? it looks awesome either way. here is a really bad pic

alt="" />

alt="" />

 

[pullins125]

but then why are mushrooms growing underneath other mushrooms with colors and then two mushrooms grow with nothing covering them be not getting enough light? that vert well could be it but i think they getting plenty of light. at least more light then some of my other mushrooms that are thriving. Is there such a thing as white mushrooms?

 

[acroholic]

Not enough light.