8 Scientific Proceedings, Royal Dublin Society. 
Algze of the N.E. coast of Ireland, 1834, for many years past in 
the Royal College of Science, Stephen’s Green. This specimen was 
probably part of the same material as that from which Dr. Moore 
supplied Professor Harvey in the Trinity College Herbarium. 
3. A specimen in the Herbarium of the Science and Art 
Museum, Kildare-street. I think it right to point out, before 
recording the result of my own examination of this material 
collected fifty years ago, first that the genus Litosiphon was 
founded in 1849 by Harvey’ at the suggestion of Dr. Moore, who 
had noted the affinity of Asperococcus pusillus, Carm., and Bangia 
Laminarie, Lyngb. ;* secondly, that Harvey in lis description of 
Lntosiphon Laminarie, states that ‘the [peripheral] cells some- 
times separate into four smaller cells which occupy the space of 
one cell.”” This condition is represented in the illustrations of 
the plant. Lyngbye, under Bangia Laminarie, and J. G. Agardh, 
under <Asperococcus’ Laminarie, speak of the “granula” being 
“quaterna” or “subquaterna” in Litosiphon Laminarie. The 
chromatophores in the cells being granular, large, more or less 
parietal, and not untrequently arranged, as seen from the outside, 
apparently in fours, made it difficult to distinguish between 
ordinary vegetative cells and the plurilocular sporangia. Having 
spent considerable time in the examination of this herbarium 
material I have been led to the following conclusions :— 
1. That the filaments of Litosiphon Laminarie are not always 
multiseriate as stated by Reinke; that uniseriate filaments, though 
young, sterile, and rare, do occur in the material examined. 
2. That in some of the material, at any rate, all the filaments 
are fertile, as in Pogotrichum hibernicum. 
3. That filaments with plurilocular sporangia are to be found 
sometimes in the same tuft with filaments producing unilocular 
sporangia. 
4. That the filaments with plurilocular sporangia agree with 
the larger filaments of Pogotrichum hibernicum with plurilocular 
sporangia. 
d. ‘hat the wart-like swellings and endophytic organs of Z. 
1W. H. Harvey, Phyc. Brit., Pl. 
* Lyngbye, Tent. Hydrophy. Dan., Tab. 24, B., 4 figs, p. 84. 
8 J. G. Agardh, Sp. Alg., 1., p. 79. 
