Vol.1] Reed. — Two New Ascomycefous Fungi. 149 



difference is so great that it is not at all probable that it is the 

 algal associate in the composite plant. 



Tne Ulva, however, which always grows with the composite 

 is somewhat different in general appearance. It has smaller, 

 broader, and thinner fronds, and is a much lighter green than 

 the composite. The cross sections, however, resemble each other 

 in almost every detail. The size, shape, and arrangement of the 

 cells, and the thickness of the outer gelatinous layer are about 

 the same. The thickness at the base of the frond is 67-100 /a, 

 and the upper part of the frond 33-60 /*, while the ceUs are 

 10-13 /(A long and 5.5-7 /^ wide. All these measurements 

 correspond quite satisfactorily with the composite plant. The 

 base and stipe of the two fronds are quite different. The 

 composite has a slender stipe gradually widening into the base 

 of the frond, and is brownish to hyaline, with but few small 

 algal cells, which seldom ever elongate into tubes growing down 

 towards the hold-fast. The Ulva, however, has Init little or no 

 stipe, as the frond spreads abruptly from the base into a broad 

 oval. The character of the cells near the base is entirely different, 

 as they become much larger, while the lower cells form long tubes 

 which descend into the hold-fast. Yet these differences might be 

 due to the association of the fungus in the composite plant ; so that 

 it seems that there is very little doubt that this associate Ulva is 

 the algal part of the composite plant. There is also little doubt 

 that this Ulva is U. Calif or nica Wille, as it resembles the 

 authentic specimens published in Phycotheca Boreali- Americana, 

 No. 611. The cells of U. Calif or nica Wille, are more quad- 

 rangular and slightly thinner and smaller, and have less gelatin 

 outside, but these slight differences might be easily explained by 

 the different localities in which they were collected, or the method 

 of preservation and time of collecting. Wille' s specimens were 

 collected at San Diego, but the species is probably common all 

 along the California coast, and like most plants doubtless varies 

 somewhat with the locality. 



The algal portion cannot be Enteromorpha Linza or E. 

 mhiima because of their very different structure; nor can it be 

 Ulm Lactiim L. or U. fasciafa Delile, because of the very great 

 difference in size, habit, and general structure. We can there- 



