Pic­tures Con­sid­ered #50 by Christoph — We of­ten talk slop­pily of «al­gae» or «pro­tists» on these pages when we con­sider, rarely enough, uni­cellular eu­kary­otes. For my part, I at­tach lit­tle im­por­tance to bi­o­log­i­cal sys­tem­at­ics or tax­on­omy per se be­cause I'm more in­ter­ested in learn­ing how liv­ing be­ings go about their busi­ness than in sort­ing them into var­i­ous draw­ers. There­fore I mostly con­fine my­self to the names of the...