Sentence:  The <WSD>Lumper</WSD>, as they call this particular variety of pots, is a symbol of this Irish dilemma, for this is the infamous potato that failed in the 1840s and caused the great famine. The <WSD>Lumper</WSD> is therefore one of the most historic of all the heirloom potato varieties now preserved under the careful eye of historic museums and potato enthusiasts alike, myself included. 
Meaning of the word marked with <WSD> tags:  A variety of potato, best known as the variety that failed in the Irish potato famine.