LICHENES — DR JEAN MULLEE. 345 



1. SYNECHOBLASTUS. 



Synechoblastus, Trevis. Caratt. di tre nuovi gen. di Coll. p. 1 (1853). 

 Leihagrium, Mass. Mem. 90 (1853). 

 Collema, pr. p. Auct. 



A genus of some twenty species, partly dispersed over all countries of the globe. 



Synechoblastus of Trevisan has undoubtedly priority over Massalongo's Letha- 

 grium, published in the same year, as it is quoted as synonym by Massalongo 

 himself. The fact that Leihagrium is a name of Acharius (Lichenogr. Univ. 

 1810, p. 646), has no signification in the question, this name having been 

 published as a section, not as a genus. 



1. ? S. multipartitus, Hepp. Fl. Eur. n. 663. 



Speciminula statum juveuilem 1-5 mm. latum hujus speciei bene simulant, at apotheciis 

 primariis (spermogoniis) tantum ornata sunt. Hyphidia visa circ. 3-o^yu, longa, ellipsoideo- 

 cylindriea, utrinque. subiucrassata. Gonidia subdepauperato-concatenata. Epidermis non 

 cellulosa. 



Propter defectum apotheciorum bucusque non omnino species certa. 



Socotra. Calcicola. B.C.S. 1301 pro parte. 



Distrib. This European species goes from England to the southern lime- 

 stone regions of Europe. As the spores have not been observed in the Socotra 

 specimens, the determination is necessarily somewhat doubtful, and the species 

 therefore may not go so far southwards. 



2. S. flaccidus, Korb. Syst. p. 413. 



Three varieties of this species are endemic in Socotra, but the typical form 

 of the species is widely dispersed in the temperate and colder or at least not 

 tropical parts of the old world and in the United States. 



a. var. subnigrescens, Mull. Arg. in Proc. Roy. Soc. Edin. xi. 

 (1882), 457. 



Tballus nudus, olivaceo-fuscus, margine minus adscendens, multo minor quam in forma genuina 

 europaea, distincte sed non crebre subradiatim (irregulariter) rugoso-plicatus. Sporse 

 22-30 fj, longse, 6-8 y, late. 



Prima fronte 8. nigrescentem, Anzi, fallaciter simulat, sed tballus minus adpressus, minus crebre 

 et minus regulariter rugoso-plicatus, subtus non distincte longitrorsum plicato-costatus, 

 totus magis olivaceo-fuscus, apothecia minus numerosa et demum distincte majora et 

 sporarum ambitus demum constanter latior et ipsfe utrinque multo minus acuminate. 



Socotra. In ramulis Rhoiclis supra Wadi Kischen, alt. 800 et 1000 m. 

 Schweinf. 



TRANS. ROY. SOC EDIN. VOL. XXXI. 2 X 



