204 LICHENES ANTILLARUM A W. R. ELLIOTT COLLECTI. island, and the introduction of cattle and importation of foreign seeds would naturally add to their number. More precise observa- tions on this point will be awaited with interest. Returning to our own country, it would be instructive to observe carefully whether the plant tends to extend itself or to die out in the localities where it has already been recorded. If ultimately it can be proved that it is an introduction, it might be very interesting to notice whether it tends to vary in our country as it does in America. The diagnoses given by Engler of the two most distinct N. American forms are appended. This is done not with the object of lengthening our catalogue of British plants, but to accumulate records of varying forms which may eventually guide us to a better understanding of the laws of variation. J. TENUIS Willd. Var. /3. secimdus Engelm. ramis paniculse spatham exce- dentibus erectis incurvis ; floribus minoribus secundus. — J. secundus Poir. Var. y. congestus Engelm. ramis paniculse quam spatha brevi- oribus abbreviatis ; floribus fere in capitulum congestis ; sepalis fusco-striatis ; capsula e stramineo fusca. LICHENES ANTILLARUM A W. R. ELLIOTT COLLECTI. ExpoNiT Edv. a. Wainio. (Continued from p. 107.) Trib. 11. CcENOGONiE^. 1. C(ENOGONIUM. 1. C. LiNKii Ehrenb. ; Wain. Etud. Bres. ii. 64. Ad ramulos arborum in monte St. Andrews (2000 ped. s. m.) in St. Vincent (n. 29). Fertile. 2. C. Leprieurii (Mont.) Nyl. ; Wain. I. c. 65. Ad corticem arborum in Richmond Valley in St. Vincent (n. 230 pr. p.). Fertile. Var. PANNiFORME Wain. Thallus pannose expansus, adnatus aut ambitu anguste liber. Apothecia in latere superiore sita. Ad corticem arborum in Richmond Valley in St. Vincent (n. 230 pr. p.). Cum C. interplexo Nyl., Quelq. Obs. Coenog. 92, analogum, at in C. Leprieuiii transiens et cum eo crescens. Thallus flavescens aut viridis aut stramineus, plagas ambitu partim rotundatas formans. Gonidia 0'012-0'014 millim. crassa. Fertile. Trib. 12. Gyalecte^. 1. Gyalecta. 1. G. lutea (Dicks.) Tuck. Ad corticem arboris in Roseau Valley in Dominica. "2. G. MicRospoRA (Miill. Arg.) Wain. Ad folia arborum in Dominica et in Bonhomme Woods in St. Vincent. Excipulum
