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subhymenium
subhymenium n.
Brit. 
/ˈsʌbhʌɪˌmiːnɪəm/
, /ˈsʌbhʌɪˌmiːnɪəm/U.S. /ˈsəbˌhaɪˌminiəm/
/ˈsəbˌhaɪˌminiəm/ΚΠ
1852 J. H. Balfour Class Bk. Bot. I. iv. 314 The cells forming the hymenium and subhymenium are marked A.
1900 G. F. Atkinson Stud. Amer. Fungi: Mushrooms ii. 9 Toward the outside of the trama the cells branch into short cells, which make a thin layer. This forms the subhymenium.
2006 Mycologia 98 707/2 Two hymenial palisades often emerge in opposite directions from a single, shared subhymenium.
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as lemmas