STEIL: SOME NEW CASES OF APOGAMY IN FERNS 97 
from Dr. E. B. Copeland, Los Banos, Philippine Islands. A 
plant obtained from Mr. Anderson, fern specialist, Short Hills, 
New Jersey, was grown in the university greenhouse, and spores 
were also collected from this plant. Archegonia were never found 
on any of the prothallia. However, apogamous embryos in large 
numbers were produced. Since numerous cultures of P. sulcata 
were made and from spores obtained from different plants, there 
can be no doubt that apogamy is of constant occurrence in the fern. 
P. argyraea Moore has also been found by the writer to be 
apogamous. In many respects the prothallia and apogamous 
embryos are similar to those of P. sulcata.* In P. Parkeri Hort. 
The writer has also discovered apogamy. The prothallia become 
large as compared with those of the former but develop in a similar 
manner. : 
During the course of the investigation a large number of P. 
cretica varieties have been tested for apogamy, and so far none 
have been found which form embryos as a result of fertilization. 
The following is a list of these apogamous horticultural varieties: 
albo-lineata Alexander, maxima, magnifica, Mayii, major, Wim- 
settiit, Wimsettit compacta, Wimsettit multiceps, Wimsettii grandis, 
and Ouvrardi. For the identification of some of the above var- 
ieties the writer is indebted to Mr. James C. Clark, of Philadelphia. 
P. cretica var. albo-lineata Alexander Hort. resembles the P. cretica 
albo-lineata in which Farlow discovered apogamy only in its second 
set of leaves, which are linear but with a broader band of white 
along the main veins of the pinnae. The first leaves are nearly all 
crested, while the linear leaves show sometimes a slight tendency 
to become crested. From the investigations which have already 
been made, it may be predicted that all Pteris cretica forms are 
apogamous. Apogamy has not so far been found in any of the 
varieties of P. serrulata L. f. 
APOGAMY IN ASPIDIUM 
Apogamy was found by De Bary (1878) in Aspidium falcatum 
(L. f.) Sw. and in a crested cultivated variety of A. Filix-mas (L.) 
* According to Christensen (Ind. Fil. 593, 608. 1906) P. sulcata, P. quadriaurita 
and P. argyraea are all synonyms of P. biaurita L. According to Underwood and 
Benedict (Bailey’s Stand. Cycl. Hort. 2852. 1916) P. quadriaurita is distinct from 
P. biaurita, P. argyraea being given as a var. argyraea Hort. under P. quadriaurita. 
