'JNfi THAXTER. — MONOGRAPH OF THE LABOULBENIACE^B. 
in individuals growing on the integument of host; producing a variable number of fertile branches, 
disposed subhorizontally on either side of the primary receptacle, the perithecigerous cells, of which there 
may be from one to six, together with the male individual when present, and the bases of the perithecia, 
protected by a shield- or shell-like, usually very unequally bilobed cellular upgrowth, rounded or bluntly 
pointed above, the symmetrically curved successive cells which compose it enormously elongated trans- 
vei lv, their lumen scarcely wider than the intervening walls and forming a series of concentrically ar- 
ranged arcs, the concavities directed downward. Perithecia one to six, commonly five in well-developed 
l>eciiiicns, slightly divergent from the median line, long, pointed, tapering from the slightly, more or less 
asymmetrically inflated base; the distal portion not clearly differentiated, tapering more or less, curved, 
the slender upper portion bent abruptly inward toward the tip; the pointed apex bent inward, subtended 
externally by a terminal, slightly incurved, rather slender, bluntly pointed unicellular process, the cells 
of the cell row which it terminates distinctly larger than the other wall-cells; basal cells somewhat prom- 
inent. Spores 10 X 1.5 it. 
30-36 
Secondary receptacle, 
including protective shield, in well-developed individuals 125 X 75 p; in small specimens 35 X 50 p; 
35-110 
On Periphnrta Americana Sauss. (type form), Cambridge (Mr. Bullard): Bermuda, Mus. Comp. 
Zool. < )n Periplaneta Australasia: Sauss., Bermuda. On Periplaneta spp., Mexico, West Indies, Pan- 
ama, Brazil, Africa, South Seas, China. All Mus. Comp. Zool. On Stylopyga oriental™ Scudd., Boston, 
Mns. Comp. Zool. 
This common, and in its typical condition, very striking form, appears to be as universally distrib- 
uted as are its cosmopolitan hosts. It is remarkable for its variability on different hosts or in different 
p itions on the same host. Thus the shell-like shield of the typical form is very frequently absent in 
sp omens on Stybpyqa, the form represented in fig. 8, being that which occurs most commonly on this 
hast, while on Periphnrta it is rarely seen. On Stylopijga, moreover, the shield-like covering, when it 
is developed at all, is usually much smaller than in individuals growing on Periplaneta, and the number 
of Perithecia is usually less. In individuals of the type represented in fig. 8, one often finds instances in 
which two secondary receptacles have developed from the primary one, each producing its solitary peri, 
thecium, the two seeming to be paired. 
In the normal typical form (fig. 7) the cells beneath the shield are so closely compacted that I have 
not been able to satisfy myself as to the exact relations of the structures developed from the female pri- 
mary receptacle As in other cases, however, the subbasal cell of the latter seems to cut off a number of 
«US diMally each of which produces a fertile branch (fig. 12); there being usually five such branches, 
as shown in the figure; the lower cell, at the left in this figure, being the basal cell of the receptacle from 
the foot k broken If each of these branches produced its single perithecium one would have the 
fan hT" l^ " that USUa11 ^ f0Und ' ** *W*"I bearing five perithecia; one, supposedly, 
* rnc T L V han , fi / e ° CCUr ' " ^ ^^ k "»? «" ™ d »« a — "- — 
ot b.anches have been developed from the subbasal cell 
of one TS^l %S ' 10 ' ° r d ? WU1 Sl,OW h ° W thc W»* bilobed *" «■ P»*«d by growth 
a L c -1 ir - v ; ccept r 1 r upward and ° ut ™ d > - ^ ** ** -** «™ » on <& ^ 
■ 1 i'tinl C sh n *; PC [ ltheCiUm " this *•*" and thfi P-*» - d character of its ter- 
* m 7X£ttZrJ**Z. P'-e XXXIX, figs. 3-4. 
length 
^dividual consisting of four superposed 
July, 1905. 
Total 
