1922] Setchell-Gardner : PJiycological Contributions 391 



Growing on the blade of Alaria tenuifolia. Friday Harbor, "Wash- 

 ington. Type, Gardner, no. 4041 (Herb. Univ. Calif., no. 207004), 

 July. 



This species, like Strehlonema myrionematoides and S. scabiosum, 

 has the larger part outside of the host. It penetrates to a considerable 

 depth among the cells of the uninjured host, later apparently mechanic- 

 ally causing the death of a few surface cells and an abnormal gro^rth 

 of others, giving to the surface a rugose appearance. The plants seem 

 to associate in small groups of indefinite shape and size, often con- 

 fluent and, although small, can readily be detected by the peculiar 

 appearance they give to the host. 



Streblonema transfixum sp. nov. 



Frondibus maculas 5-8 mm. diam. f ormantibus ; filamentis repent- 

 ibus inter cellulas hospitis profunde penetrantibus, distortis, irregu- 

 lariter ramosis, 4— Sju, diam., filamenta dispersa, curta erecta, eramosa, 

 e superficie hospitis protusa et a gametangiis terminata emittentibus ; 

 cellulis filameutorum erectorum cylindricis, 7-9//, diam., 0.75-1. 5-plo 

 longioribus; chromatophoris taeniatis, parietem cellulae proxime 

 tegentibus; zoosporangiis ignotis; gametangiis cylindrico-conicis, 

 obtusis, 40-60ju, longis, 8-12/* latis; loculis 1-2-seriate. 



Growing on Desmarestia ligtdata f. Jierhacea. San Pedro, Cali- 

 fornia. Type, Gardner, no. 1992a (Herb. Univ. Calif., no. 207001), 

 September. 



Strehlonema trans fixum, here described, forms definite, discolored 

 areas on the surface of the host, readily detectable. The species is 

 described from dried material. The cells of the host are much collapsed 

 and do not straighten out when soaked and boiled, hence the details 

 of the species are not so thoroughly and satisfactorily presented as is 

 desirable. The plants penetrate among the cells of the host and seem- 

 ingly pass clear through it. Just how much constitutes a single plant 

 cannot at present be made out. 



Streblonema corymbifenim sp. nov. 



Plate 43, figure 8 



Frondibus microscopicis, filamentis irregulariter alterne ramosis 

 et inter cellulis hospitis penetrantibus compositis, ramulis fructiferis 

 plane aggregatis, fasciculos corymbiformes prope superficiem hospitis 

 formantibus; cellulis plerumque cylindricis, pro parte irregularibus, 

 4— 5/A diam., 1.5-4-plo longioribus; chromatophoris taeniatis, parietem 

 cellulae non tegentibus; zoosporangiis ignotis; gametangiis cylindricis 



