5ish, no, he certainly doesn’t mean Ha’aruch Meshach. That is a commentary on the first volume of Yoreh Deah; how would potatoes or mushrooms come up there? And why would you even think of that sefer in the first place? No, he means exactly what he says, the Aruch. But the Aruch never heard of potatoes, let alone saw one, and obviously does not mention them at all. He says truffles and mushrooms are shehakol, because they are fungi, not plants. The Ropshitzer simply confused potatoes with truffles. And of course there is no possible dispute as to the FACT that potatoes are plants, not fungi. So the Ropshitzer’s psak was wrong, and it is wrong for anyone to follow it.
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