- 56 - 
27. Usnea cornuta var. gracilescens Jatta. 
“Biobio (Conception),” Chile. (Malpig. 20 : 3. 1906.) 
“Thallus contracto-gracilescens, magis ramosus, intricatus.” 1 . c. 
28. Usnea gracilis Pers. 
“in America?” (Annal. Wettau. Gesell. Nat. 2 : 19. 1810. PL 10. f. 6 . 
“virescens, lorulis filiformibus, orbiculis sparsis' setosis parvulis” . . . 
“Lorula horizontalis, flexuosa, patentia. Affinis Usneae barbatae.” non Usnea 
gracilis Ach. (Lich. Univ. 627. 1810 though based on Usnea gracilis Pers. 
Usnea gracilis Ach. was described from “Insula Borbonia” as follows: “thallo 
pendulo laevissimo nitido filiforrqi albo, ramis raris conformibus rectis simplicibus 
subfibrillosis.” 
In the ’s Rijks Herbarium te Leiden, Holland. 
29. Usnea sulphurea var. granulifera Wain. 
“Detroit de Gerlache.” “l’lle Auguste, 64° 2' de latitude sud.” ‘Tile 
Brabant, 64° 21' de latitude sud.” “Cap Anna Osterreith, 64° 33' de latitude 
sud, Terre de Banco.” (Result. Voyage S. Y. Belgica, Bot. 6: 11. 1893. 
Tab. Ill, fig . jp.) _ 
“Thallus partim crebre verruculosus, soraliis applanatis aut vulgo gemum 
tuberculiformibus, obscure cinereis, apices versus abundanter instructus, ceterum 
flavens aut apicibus plus minusve nigricantibus. Stratum myelohyphicum 
crebrum, KHO non reagens, Axis chondroideus jodo caerulescens. Excipulum 
ciliis destitutum subtus soraliis instructum, saepe reticulato-rugosum.”' 
30. Usnea Hierony mi Kremphl. 
“Prope Oran, in Sierra Tucreman,” Argentina. (Flora 61 : 436. 1878.) 
“ Planta, caespitem densum e multis speciminibus singulis compositum 
eff ormans. Specimenis singuli thallus erectus (alt. circ. 6-8 centim.), cinereo- 
virens vel virescens, ramoso-virgatus, stipites (rami primarii) ramulique teretes 
striato-aut papilloso-vel verruculoso-scabrida (papillis et striis albidis), subtus 
versus solum subnudi, nigricantes, crebre fibrillosi, fibrillis plus minus longis, 
scabridis, adscendentibus (non horizontalibus!) ; apothecia terminalia, lat. usque 
ad I centimet., peltiaut scutelliformia, horizontalia, disco pallido, margine re- 
ceptaculari fibrilloso-ciliato fibrillis longis, excipulo subtus tenuiter nervoso vel 
scrobiculato; sporae snae, ellipsoideae, simplices, hyalinae, long o. ,009-011, 
crass .0,006-007 mm.” 1. c. 
= U. barbata var. Hieronymi Mull. Arg., (Flora 72 : 62. 1889.) 
31. Usnea Baileyi f. implexa Zahlbr. 
“prope S. Amaro,” “Prov. Sao Paulo.” (Denksch. math, naturw. Klasse 
kaiserl. Akad. Wissen. 83 : 191. 1909.) 
“Thallus erectus vel sub prostratus, usque 9 cm. altus, dense ramosus et 
implexus, ramis primariis cylindricis vel subcylindricis, 0.6 -imm crassis, ad 
apices uncinatis vel incurvis, in parte superiore sorediis subpunctiformibus, 
planiusculis, albidis, demum plus minus confluentibus obsitis. Structura interna 
ut in planta typica. Apothecia non visa.” 1 . c. 
In the K. K. Naturhistorisches Hofmuseum, Vienna. 
32. Usnea laevis var. implexa Mull. Arg. 
“monte Itacolumi.” Brasil. (Hedw. 30 : 225. 1891.) 
“thallus ut in v. aspera, at subdecumbens, e basi intricatim implexo-ramosus, 
rami longius filiformi-attenuati;” .... “varietates ambae ab Usn. laevi 
Nyl. specifice non differunt. Apothecia in iisdem caespitibus ludunt margine 
meda et plus minusve ciliata, dorso plus minusve papilloso-aspera; rami primarii 
