66 PROCEEDINGS OF THE AMERICAN ACADEMY 



later complex structure the frond surpasses anything of the kind found 

 in either of the other two genera. In the structure of the antheridia, 

 Tuomeya rather resembles Batrachospermum, but in the specialized 

 antheridial branches and their position at the nodes, it comes very 

 near to Lemanea. In the possession of a special procarpic branch, 

 Tuomeya is like Lemanea, but in the development of the fruit it comes 

 very near to Batrachospermum. All recent writers have agreed that 

 Lemanea and Batrachospermum are nearly related, but Tuomeya, as 

 may be seen from my comparison, brings them still nearer to one an- 

 other. It may be a question as to which genus Tuomeya approaches 

 most nearly, so very near does it approach to each of them. 



It seems best to say a few words here in regard to a plant which 

 has been referred to the genus Tuomeya as an additional species. In 

 the Bulletin of the Torrey Botanical Club for 1877 (November), 

 Rev. Francis Wolle describes a new species of alga, found by him at 

 Bethlehem, Penn., which he makes the type of a new genus, under 

 the name of Entothrix grande. Specimens were distributed in Ra- 

 benhorst's " Die Algen Europas," where by a misprint the name 

 appears as Entothrix grcedis, n. sp., Wolle. In his " Fresh Water 

 Algag of the United States," (Bethlehem, 1887,) on pages 53 and 54, 

 and Plate LXVI. Figs. 2 to 8, Mr. Wolle figures and describes this 

 plant, and refers it to the genus Tuomeya as T. grande, Wolle, dis- 

 tinguished from T. Jluviatilis, Harv., by its uubranched and tubular 

 frond. I am indebted to Professor Farlow for the privilege of exam- 

 ining the specimens distributed by Rabenhorst, and Mr. Wolle has 

 been so kind as to send me authentic specimens from his own her- 

 barium. Careful sections from both sets of specimens show that this 

 plant possesses the complicated axis, cortex, and lateral tubes charac- 

 teristic of Lemanea, as limited by Sirodot, as well as the hollow frond 

 and cystocarps of that genus. Professor George F. Atkinson of Au- 

 burn, Ala., has just published a preliminary note on the synonymy of 

 this species (Bot. Gaz., XIV. 292), and has referred it to Lemanea 

 as L. grandis, (Wolle) Atkinson. As far as is known, then, there is 

 only one species of Tuomeya* 



* I have very lately received, through the kindness of Professor Atkin- 

 son, a copy of the extra issue of liis " Monograpli of the Lemaneaceaj of the 

 United States," which is to appear in the May number of the Annals of 

 Botany. In tliis paper, Professor Atkinson gives a full description, with figures, 

 ot Lemanea grandis, (Wolle) Atk. 



