BY AVM. HY. PEARSON, M.SC, A.L.S. 167 



notes in English, that his Jung, stygia is related to Gym. 

 concinnatum and Gymn. adiistuon, we may reasonably conclude 

 that the stems of Gymnomitrium were his type of the species, 

 so, as I have been unable to distinguish them from Gymn. 

 concinnatum, I consider it as a synonym of that species. 



Further, Mr. Rodway writes under Gymn. concinnatum, 

 (Lightf.), Corda (Trans. Roy. Soc. Tasm., p 74, 1916) :— "In 

 "exposed situations on mountains the leaves more closely 

 "appressed and entire; marginal cells elongated and irregular, 

 "forming an erose colourless border. — Cesia erosa, C. et P." 

 With this opinion I cannot agree. 



The late Dr. Carrington, who was one of the most careful 

 students of the Hepaticse, and who spent endless time in their 

 study^ and before publishing anything as new would for weeks 

 and months let his mind play freely round any species he was 

 studying, had an undoubted opinion that C. erosa was a good 

 and new species. I candidly admit that the specific name is 

 misleading. One would naturally infer by the term "erosa" 

 that the leaves were weathered, hence its name; on the con- 

 trary, although the leaf margins are irregular, they are 

 bordered by a row of acute elongated cells, somewhat similar 

 to those on the margin of the leaves of Gymn. crenulatum 

 (G.). It certainly has no similarity to Gymn. concinnatum 

 (Lightf.), to which Mr. Rodway refers it; this species is 

 dioecious, whereas Gy7n. erosa is monoecious. 



Stephani (Sp. Hep., vol. II., p. 3, 1906), under the 

 generic name of Acolea, places G. erosa, C. et P., as a synonym 

 of Acolea stygia (H. & T.) St. The above notes will show 

 how mistaken he is. 



He also refers Gymn. vermicular e, Schiffner (Ex. 

 Gazelle, IV., p. 2), to Acolea stygia. Generally Schiffner's 

 figures are very illustrative, but in this case it is difficult to 

 make out what the species is; however, Schiffner is well able 

 to defend the specific value of his species. 



EXPLANATION OF PLATE XXIIL 



Fig. 1. Copy of Hooker's figrures from Flora Antarctica, PI. LVII., fig. IV. 



Fig. 2. Gymnomitrium stygia (H. et T.), Pears; x 50. 



Fig. 3. Jungermannia, growing with G. stygia; x 50 (Campbell's Island, 

 Hooker, original, ex herb. Manchester Museum.) 



