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 ______     ______             _    _   __    __  
|      \\  /_   _//     ___   | || | || \ \\ / // 
|  --  //   -| ||-     /   || | || | ||  \ \/ //  
|  --  \\   _| ||_    | [] || | \\_/ ||   \  //   
|______//  /_____//    \__ ||  \____//     \//    
`------`   `-----`      -|_||   `---`       `     
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Text this: Two new taxa of Achnanthidium and Encyonema (Bacillariophyceae) from the Yom River, Thailand, with special reference to the areolae occlusions implying ontogenetic relationship