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leptoxylem
leptoxylem n. 
/ˌlɛptəˈzaɪləm/ [xylem n.] Botany a structure in certain mosses (see quot.).
Brit. /ˌlɛptə(ʊ)ˈzʌɪləm/
, /ˌlɛptə(ʊ)ˈzʌɪləm/U.S. /ˌlɛptoʊˈzaɪləm/
, /ˌlɛptoʊˈzaɪləm//ˌlɛptəˈzaɪləm/ΚΠ
1889 A. W. Bennett & G. R. M. Murray Handbk. Cryptogamic Bot. 146 A leptoxylem or rudimentary xylem which serves for the conduction of the transpiration-current to the lower portion of the sporange furnished with stomates.
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as lemmas