alGjE from the west ixdies. 273 



p. 10, t. 34. f. ii. Sirosiplion hormoides, Kuetz. Sj^ecies AJgar. 

 p. 316; Talulce pity col Ofj. ii. p. 10, t. 34. f. iv.] 



Crass, fil. 9-13 fx. 



Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. 

 Nos. 903 and 904. Eatber scarce. On rocks, Eoseau Valley 

 (1000-2000 ft.), Dominica. (27-6-92.) No. 24. 



Var. tentje, nov. var. (PL XY. figs. 4-8.) 



Var. minor, filis tenuioribus, 5*5-7 /it crassis. 



Hah. With the typical form, but much more abundant. It 

 was intermixed with Syitiploca cuspidata, n. sp., Stigonema mi?iuia, 

 Hass., Scytonema amhigua, Kuetz., &c. 



28. Stigo^stema panniforme, Bornet et FlaJi. {Revis. des 

 Nostoc. Keterocyst. p. 71.) [Scytonema panniformis, Agardli ; 

 Sirosiphon panniformis, Kuetz.A^ 



Crass, fil. 23-26 /i. 



Hai. AVith the preceding. Another gathering from the same 

 locality had abundant hyphae (an incipient lichen). No. 779. 

 Crass, til. 15-25 fx. 



29. S. MIST7TUM, Hass. {Hist, of Brit. Freshw.Alg. i. p. 230, 

 t. 67. ff. 3-4.) 



Crass, fil. 19-25 /i. 



Hah. On damp wall of dam. Sharp's Eiver, St. Vincent. 

 No. 477. On trees, summit of Trois Pitons (4500 ft.), Do- 

 minica, no. 903 ; and on lime-trees, Shanford Estate, Dominica, 

 no. 901. 



30. S. INFORMS, Kuetz. {Species Algar. p. 319 ; Tahulw pliy- 

 colog. ii. p. 11, t. 38. f. iii.) 



Crass, fil. 44-52 ix. 



Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. 

 Nos. 903 and 904. 



Ord. Oscillartace^. 



31. Stmploca cuspidata, nov. sp. (PL XVI. figs. 1-7.) 



S. bryophila, late expansa, griseo-lutea ; fasciculis erectis, 

 angustis subulatis, aggregatis (passim densis), 8-15 mm. altis, 

 seruginescentibas ; trichomatibus aerugineis, flexuoso-intricatis, in 

 strato strictioribus, apicibus versus fasciculorum, 1-3 in lata 

 vagina inclusis, saepe interruptis, distincte articulatis ; articulis 

 diametro 2-4plo longioribus ; vaginis amplis, acbrois, pellucidis 



