ALG FROM THE WEST INDIES. 273 
p- 10, t. 34. fii. Sirosiphon hormoides, Awetz. Species Algar. 
p- 316; Zabule phycolog. ii. p. 10, t. 84. f. iv.] 
Crass. fil. 9-13 p. 
Hab. On trees, summit of Trois Pitons (4500 ft.), Dominica. 
Nos. 903 and 904. Rather scarce-—On rocks, Roseau Valley 
(1000-2000 ft.), Dominica. (27-6-92.) No. 24. 
Var. TENUE, nov. var. (Pl. XV. figs. 4-8.) 
Var. minor, filis tenuioribus, 5'd-7 pe crassis. 
Hab. With the typical form, but much more abundant. It 
was intermixed with Symploca cuspidata, n. sp., Stigonema minuta, 
Hass., Scytonema ambigua, Kuetz., &e. 
28. STIGONEMA PANNIFORME, Bornet et Flah. (Révis. des 
Nostoc. Hétérocyst. p. 71.) {Seytonema panniformis, Agardh ; 
Sirosiphon panniformis, Awetz.] 
Crass. fil. 23-26 p. 
Hab. With the preceding. Another gathering from the same 
locality had abundant hyphe (an incipient lichen). No. 779. 
Crass. fil. 15-25 p. 
29. S. minurum, Hass. (Hist. of Brit. Freshw. Alg. i. p. 230, 
t. 67. ff. 3-4.) 
Crass. fil. 19-25 p. 
Hab. On damp wall of dam, Sharp’s River, 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. rnrormE, Kuetz. (Species Algar. p. 319; Tabule phy- 
colog. ii. p. 11, t. 38. f. iii.) 
Crass. fil. 44-52 p. 
Hab. On trees, summit of Trois Pitons (4500 ft.), Dominica. 
Nos. 903 and 904. 
Ord. OsScILLARIACEE. 
31. Symproca cusripata, nov. sp. (PI. XVI. figs. 1-7.) 
S. bryophila, late expansa, eriseo-lutea ; fasciculis erectis, 
angustis subulatis, aggregatis (passim densis), 8-15 mm. altis, 
eruginescentibus ; trichomatibus wruginels, flexuoso-intricatis, in 
strato strictioribus, apicibus versus fasciculorum, 1-3 in lata 
vagina inclusis, sepe interruptis, distincte articulatis ; articulis 
diametro 2~4plo longioribus; vaginis amplis, acbrois, pellucidis 
