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ERYTHROTRICHIA 79 
In the Spatoglossum material we have observed no spores on the 
discs, but they are abundant in erect fronds after they reach a 
width of eight cells. These spores are, however, a little smaller 
than those that occur on the discs of the Chaetomorpha, having a 
diameter of 8-11 и, while those of the Chaetomorpha have a diam- 
eter of 11-14 и. 
Erythrotrichia polymorpha is evidently allied to the imperfectly 
known Erythrotrichia ciliaris (Carm.),* originally described from 
Scotland, yet we have felt unwilling, for the present, to dispose of 
it as a variety or form of that species. For our knowledge of Е. 
ciliaris we are indebted chiefly to Batters’ description (loc. cit.) of 
Carmichael's original plant now preserved at Kew and to his iden- 
tifying with it a specimen collected at Arbroath, Scotland, by E. M. 
Holmes. The British plant appears to have a greater development 
of the erect filaments and usually a less development of the basal 
disc than is the case in the Peruvian; its disc is more pulvinate, 
sometimes almost hemispherical, and the disc-margins are less 
long-celled and repent; the broader parts of the erect filaments 
or fronds (in the Arbroath plant on Corallina, at least) have 
irregular, jagged, subdentate, or sinuate-undulate margins, and 
in these parts the cells are more angular and average to have 
about twice the diameter of the corresponding cells in the Peruvian 
plant; the spores have been observed оп the “fronds” only and 
are said by Batters to have a diameter of 18 и, which is about 
twice the average diameter of the “frond ” spores of Е. polymorpha. 
The fact that the disc alone of Erythrotrichia polymorpha is 
commonly all that is present оп Chaetomorpha and Cladophora 
naturally suggests at once a relationship with the pe of the ad 
of Naples described and figured by Berthold { as Erythrot 
discigera, especially as Berthold remarks that discs alone were 
observed by him on Chaetomorpha and Cladophora species (loc. cit. 
4) and that cultivated discs of E. discigera produced spores (loc. cit. 
19). However, from Berthold's description and figures, one would 
hardly be justified in identifying the Mediterranean plant with 
* Erythrotrichia ciliaris (Carm.) Thuret, p.p. in Le Jolis, Liste Alg. Mar. Cher- 
bourg 103. 1863; Batters, Jour. Bot. 38: 374. 
+ Mitth. Zool. Stat. Neapel 3: 511. 1882; — ‘Golf. Neapel 4, 25. pl. г. f. 
15-18. 1882. 
