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fasciculatum Harv. in the main to be referrible to that species. 

 By the liberal communications of Mr. Batters as to Harvey's 

 Lithothamnia there are, so far as he knows, no really authentic 

 specimens in existence. I, however, got under the name of L. 

 fasciculatum two specimens gathered by Mr. G. VV. Traill at 

 Falmouth, where the plant according to Mr. Batters has grown 

 in the same locality since Harvey's time. They unfortunately are 

 dead, bleached and rather rubbed, probably found cast on shore, 

 and they cannot be determined with certainty, very likely, however, 

 belonging to L. fruticulosum and most closely related to the typi- 

 cal form. 



I in part refer L. fasciculatum Farl. to the species in que- 

 stion, on the authority of Mr. F. S. Collins, who kindly sent me 

 a specimen stated to be the form recorded by Farlow 1. c. under 

 that name. It is said to be „ common in pools at low- water mark 

 along the coast of Maine". However, it appears, as if the speci- 

 men that I got has been washed ashore from the sublitoral region. 

 This specimen I without any doubt refer to L. fruticulosum, stan- 

 ding between f. typica and f. intermedia, however, most nearly 

 related to the latter. It is only 2 — 3 cm. in diameter, having appa- 

 rently at first nearly surrounded a stone or another hard object, 

 which is fallen out, and the cavity appears partly being effaced 

 by new-formed tissue. The conceptacles are very little prominent 

 and slightly convex, the roof about 250 p. in diameter, intersected 

 with about 30 canals, and they finally grow down into the frond. 

 The four-parted sporangia are 90 — 115 fi long and 35 — 45 p. broad. 

 A specimen kindly sent me by Prof. Farlow himself will be men- 

 tioned under L. colliculosum. 



Another specimen that I received from Mr. Collins most pro- 

 bably belongs to the form fastigiata. Collins' coll. A. „Eagle 

 Island, Maine. In pools at dead low water". It is sterile and 

 fragmentary, but has apparently been small, about 2 — 3 cm. in 

 diameter. The lower part shows a tendency to form lobes, the 

 branches fastigiate, with short axes, and rather anastomosing. The 

 ends are obtuse or truncate, but in part somewhat denudated. The 

 structure also accords with that of L. fruticulosum. Overgrown 



