List of Besmidiese, &g. Bij J. P. Bisset. 197 



CYLINDBOCYSTIS Menegh. 



1. C. BreUssonii Menegh Frequent. 



2. C. diplospora Lundell (Desm. Suae. 



p. 83, t. V. fig. 7) Brantfell and Claife Heiglits. 



PENIUM Brel.. 



1. P. Digitus Ehrb Common. 



2. P. lamellosum Breb Brantfell and Lindeth. 



3. P. interruptum Breb Frequent. 



4. P. closterioides Ralfs Ditto. 



5. P. Navicula Breb Ditto. 



6. P. margaritaceum Elirb Brantfell, Lindeth, and Claife Heights. 



7. P. cylindius Ehrb Lindeth. 



8. P. polymorphum Perty Common. 



9. P. minutum (^Docidium minutum) Balfs Ditto. 



10. P. lagenaroides'E.oy Ti.s Brantfell, Lindeth, and Claife Heights. 



Fig. 6. — Frond shaped as figured. Endochrome in well-marked fillets, 

 five of which are generally seen in front view. Membrane rather 

 sparsely punctate. Length, 95 n ; breadth, 45 fj.. Previously found on 

 Deeside and in Arran, Scotland. 



11. P. cucurUtinum Bisset n. s Lindeth and Blea Tarn. 



Fig. 7. — Frond shaped as figured. Endochrome in fillets, three of which 

 are usually seen in front view. Membrane sparsely punctate. Length, 

 85-90 jti ; breadth, 32-35 n. This form is not uncommon on Deeside, 

 Scotland. 



DOCIDIUM Breb. 

 1. D. Baculum Breb Lindeth and Claife Heights. 



PLEUBOT^NIUM Nag. 



1. P. Trahecula Ehrb Frequent. 



2. P. clavatum Klitz Brantfell and Lindeth. 



3. P. truncatum Breb Brantfell. 



4. P. nodulosum Breb Ditto. 



SFIROTjENIA BreTj. 



1. 8. condensata Breb Frequent. 



2. S. obscura Kalfs Brantfell and Easedale. 



3. S. parvula Archer Lindeth. 



SPH^BOZOSMA Corda. 



1. S. excavatum Ealfs Frequent. 



EYALOTHECA Ehrb. 



1. E. dissiliens Smith Common. 



BAMBU8INA Kiitz. 

 1. B. BreUssonii Kiitz Common. 



DESMIDIUM Ag. 



1. D. Swartzii Ag Brantfell, Lindeth, and Claife Heights. 



2. D. aptogonum Bre^b Brantfell and Lindeth. 



GONATOZYGON De Bary. 



1. G. Ealfsii De Bary Brantfell. 



2. G. Brebissonii De Bary Brantfell, Lindeth, and Claife Heights. 



