522 University of California Puhlications in Botany [Vol. 8 



Punctaria expansa is apparently a very rare though distinct species, 

 the foregoing material referred to being the only collection known. 

 The habit of growth' is the same as that of a group of fair sized Vivas. 

 It was found growing in a secluded cove in which the water rises and 

 falls but slightly through a small channel with the change of tide, and 

 is not disturbed by the action of wind. The plants are exceedingly 

 fragile, being scarcely tough enough to hold their own weight when 

 first removed from the water. They give up their brown color soon 

 after being removed from the water when they superficially resemble 

 almost perfectly an expanded Viva. The fruit, especially the zoo- 

 sporangia in our specimens, is decidedly sparse, likewise the hairs. 



We have been able to examine a few small young specimens of 

 Homoeostroma undulatum collected and thus labeled by Saunders 

 (1901, p. 419). They are not fruiting, are densely covered with 

 diatoms and do not soak out readily. We are, therefore, on account 

 of the state of the material, unable to place it and hence are not 

 including it in our list of species. 



FAMILY 8. ASPEEOCOCCACEAE foslie • 



Fronds ligulate or saccate, simple, differentiated into two kinds of 

 tissue, an inner one, composed of nearly colorless cells and an outer 

 cortical color bearing one ; growth trichothallic at first, later inter- 

 calary ; hairs present, and in some species, paraphyses ; zoosporangia 

 on full-sized, or macroscopic, plants ; gametangia, so far as known, on 

 reduced, but not microscopic plants, not so definitely collected into 

 sori as is the case with the zoosporangia ; both zoosporangia and game- 

 tangia projecting from the surface and collected into sori scattered all 

 over the frond except at the base. 



Foslie, Mar. Alg. Norway, Cont. I, 1890, p. 88. Asperoco'cceae 

 Zanard., Sagg. Class. Nat. Ficee, 1843, p. 10 (in part) ; Farlow, Mar. 

 Alg. New England., 1881, p. 88. 



The Asperococcaceae, as limited to those ligulate, bullose, or nearly 

 spherical forms, solid or hollow, with the zoosporangia in distinct and 

 elevated sori, projecting and accompanied, usually at least, by distinct 

 paraphyses or hairs and in having the gametangia, so far as known, in 

 usually less' definite sori and on plants more or less reduced in size, 

 but still macroscopic, is closely related in its early trichothallic, later 

 intercalary growth to the Striariaceae, Punctariaceae, and Scyto- 

 siphonaceae, so that it is occasionally difficult to determine exactly 



