I'm looking for the the extemely rare V-IM magnification changer for the E800 scope. If you have seen a listing or have one for sale please let me know.
I have no idea for fig. 1, may be a blue-green alga. Number two is a Chrysophyte called Chrysosphaera, Ibeleive, and not Crucigenia, which is a Chlorophyte. The third is also a Chrysophyte (abundant lipids and no starch) but looks like it is encysting or in trouble.
Hope this helps,
Donald
Beautiful images!
I actually think these are very young colonies of Crucigenia. As they mature, an opening should develop in the center of the colony - that is if this is Crucigenia. I am using the 1st edition (next edition due 2014) of Freshwater Algae of North America - Ecology and Classification, editors: Wehr and Sheath. I looked through all the green coccoids and came to think this is Crucigenia, by elimination. I have authored the Tribophyte chapter in this text and looked through about 65 yellow-green coccoids listed in the chapter that are often mistaken for a sick green coccoids. I don't think these colonies are yellow-greens. Green coccoids will stain dark using Lugols. The Tribophyte coocoids produce oils. However, your images appear to have very small oil droplets(?).
Sorry for the mini-lecture,
Donald