1922] SPESSARD—LYCOPODIUM 413 
PLATE XVII. PROTHALLIA OF L. obscurum 
Fics. 65-70.—Habit sketches of typical prothallia; <2. 
Fic. 71.—Sporeling growing from prothallium which grew in inverted 
position; natural size. 
Fic. 72.—Germinating spore containing oil drops; X775. 
Fros, 73-80.—Moderately young and mature prothallia in topographic 
view; X10 
Fic. 81 .—Antheridial mass enlarged, as seen when pressed out under 
cover glass; X85. 
Fic. 82.—Opercular cells of antheridium; 375. 
Fics. 83-86.—Stages in development of PG ars. 
Fics, 87-89.—Stages in antheridial development; 775. 
Fic. 90.—Diagrammatic reconstruction of abnormal archegonial group, 
constructed from serial camera drawings. 
PLATE XVIII. ENDOPHYTIC FUNGUS 
(All figs. <775 diameters, except figs. 91 and 111, which are X about 80.) 
Endophytic fungus of L. obscurum 
Fic. 91.—Distribution of fungus in prothallium. 
Fic. 92.—-Two mycelial threads within rhizoid. 
Fic. 93.—Three special layers of cells containing the fungus; mycelial 
threads of upper layer applied closely to walls of starch-bearing cells; reproduc- 
tive cells, when present, found only in two lower layers. 
Fics. 94-105.—Intracellular reproductive structures. 
Fic. 106.—Branch of intercellular mycelium leaving prothallium at base 
of rhizoid. 
Fic. 107.—Cross-section of a rhizoid containing six mycelial threads. 
Fics. 108-110.—Intercellular vegetative structures. 
Endophytic fungus of L. lucidulum 
Fig. 111.—Distribution of fungus in prothallium, 
Fic. 112.—Two neighboring cells; one at left contains mycelial threads 
bearing reproductive structures, while other has no threads, but contains 
numerous spherical sitet whose nature has not been determined. 
Fics. 113-117.—Various reproductive structures, intracellular. 
a IGS. Lads 23. — Vegetative heaabesiiorwies intercellular. 
e found on epidermis of both species 
of Babe iong but connected with ‘internal mycelium 
Fic. 125.—Degenerated prothallia cells, with reproductive structures. 
Fic. 126.—Sporelike bodies found several times in mass of fig. 125; sugges- 
tive of ascospores 
