REMARKS ON DRUMiVIOND's MUSCI AMERICANI. 433 



the indusium, and with the latter by the reticuhited venation, 

 so that Hewardia bears the same relationship to Acliantum 

 that Schizoloma does to Lindscea. The reticulated veins 

 of Hewardia and Schizoloma readily distinguish these two 

 Genera from Adiantum and Lindscea^ in which the veins are 

 all free. 



J. Smith. 



Tabs. XVI. XVII. Hewardia adiantoides. Portion of a 

 plant; nat. size; from a sketch by Mr J. Smith. /. 2. 

 Portion of a pinna. /. 3. Sporangia magnified. 



XXX. — Remarks on Drummond's Musci Americam, col- 

 lected ill British North America, during the second Land 

 Arctic Expedition^ under the command of Sm John Frank- 

 lin, II. N — Glasgow, 1828.—% W. Wilson, Esq., War- 

 rington. 



No. 6. Phascum cuspidattnn, var. elation — In all the copies 

 of this publication which have come under the notice of the 

 writer, the specimens given are not distinguishable from the 

 ordinary state o? Phascum cuspidatiim. 



9. P. subexsertum. — Perhaps only a remarkable variety of 

 the species above named. 



12. Gymnostomum/?/j«scotc?e5. — Perhaps this Moss, together 

 with several species of Hymenostomum, enumerated in Bridel, 

 Br. Univ., are only varieties of Gymnast, microstomum, differ- 

 ing merely, and that in a very slight degree, in the length 

 of the seta and the shape of the capsule. 



16. G. latifolium. — Compare G. (Physcomitrium) Bonplan- 

 dii. Hook., which, however, is described with a plane oper- 

 culum. The seta varies much in length, in some specimens 

 one-fourth of an inch. 



19. G, subsessile.—The cajyptra of this Moss is certainly 

 different from what is usually found in G. ovatum, with which 

 it has much affinity, especially in the remaikable structure of 



Vol. III.— No. 24. 3 K 



