ADDITIONS AND CORRECTIONS. 105 



oa page 54. The two species differ from each other as follows. In numerous 

 specimens of F. Novaj-Anglise (those from Mr. James collected in August), 

 there is no indication of a second growth of diflFerently shaped leaves, such as 

 repeated observations during several years have shown to exist in P. biformis. 

 The first species has a pinnate, the second a fasciculate, ramification, with leaves 

 (in the vernal state) one half larger ; their subflexuous areolae have a length only 

 twice or thrice their width, and, being very obtuse at each end, are suggestive 

 of the name sphagnifolium, given to one of the forms of the species by MuUer. 

 F. Novse-Anglise appears to be a more prolific species ; some of the specimens 

 exhibiting fructification in all stages of growth, from the minute flower-buds, 

 cuspidate by the exserted styles of their two archegonia, and lodged in the axils 

 of nearly every leaf on the upper portion of the plant, to the mature capsules 

 of the present and the decayed ones of the preceding season. In the other 

 species the capsules are very rare, and found only near the base of the stem : 

 besides their opercula are longer. The peristome, usually supplying good dis- 

 tinctive marlisin this genus, is (as with F. antipyretica and F. squamosa) of no 

 account in distinguishing the two species under notice. 



In all the North American species of Fontinalis, and also in F. squamo- 

 sa, L. (which has not yet been satisfactorily ascertained to be a native of this 

 country), the leaves have auricles at their base, with an enlarged pellucid 

 areolation. The sporules in all are of about the same diameter, namely 255 of 

 a line. 



4. Fontinalis disticha, Hook. & Wils. Fine fruiting specimens 

 collected by Mr. James in Saco River, Crawford Notch, of the White Moun- 

 tains, New Hampshu-e, and sterile specimens found in Rhode Island by Mr. 

 Olney, indicate for this species (heretofore deemed peculiarly southern) an 

 unexpected northern range. 



5. Fontinalis L.escurii, Sulliv. — This species, intermediate be- 

 tween F. disticha and F. Dalecarlica, has the inner perichatial leaves undulate 

 near the apex, and overtopping the operculum. Fine fruiting specimens were 

 collected in the Saco River, White Mountains of New Hampshire, by ]\Ir. 

 James. 



Page 59. 



3\ Lieskea nervosa, Myrin. — Sterile specimens collected on the 

 White Mountains by the late Mr. Oakes, and at Trenton Falls, New York, by 

 Mr. James, appear to belong to this species. 



Page 64, under Pylaisseeae. 



Pterig'ynandi'uin filiforme, Hedw. — Dioecious; stems slender 

 and with the fasciculate filiform branches arcuate-prostrate, villous, stolonifer- 

 ous ; leaves erect-patent, somewhat imbricated (appressed when dry), often 

 subsecund, elliptical and obovate-spatulate, suddenly short-acuminate, con- 

 cave, serrate above, papiUose on the back, shortly bicostate, or unicostate 

 half-way ; areolation quadrate at the basal angles, rhombic at the apex, else^ 



