Note: This species was recorded in Norway for the first time in March 2005. We found a 4-5 cm tall fertile tetrasporophyte by dredging at at 5-15 m in a semi-exposed sound east of Seløy in the Fana-fjord south of Bergen. The species resembles Apoglossum ruscifolium, but can be separated from this by the lack of lateral veins in the blade, while A. ruscifolium has microscopic lateral veins. The cells in the blade tissue are also larger in H. hypoglossoides (> 60 ?m long) than in A. ruscifolium (< 20 ?m).
2 of 4: Tetrasporangial sori developing on each side of the midrib
