English: Illustration for "A New Genus of Ophioglossaceae" by Harold L. Lyon., Unversity of Minnesota, in Botanical Gazette Volume 40, page 456 (Dec. 1905). The caption reads:

Fig. 1. - Photomicrograph of a section through a gametophyte and young sporophyte of Sceptridium obliquum. The section is vertical, and transverse of the gametophyte. The root is already protruded from the under side of the gametophyte, while the position of the first leaf was marked by a pronounced elevation on the upper side. a, archegonium; s, suspensor; t, stem tip; l, first leaf; r, root. X 60.